I mean we payed for the malayan tapir, we payed for 8 animals but received 7 animals and a colorvariation for the bairds tapir.
I think its perfectly reasonable to expect this to get changed.
By all means, if we go by the definition of "we paid for this", "It's a business" and "all interactions are purely financial", then you missed your window of opportunity. You had the chance to vote with your wallet on multiple occasions, from not buying it in the first place to asking for a refund to not buying subsequent DLCs as a sign. If we really want to bring it down to just that, then it's simply too late and downright pointless to still bring it up more than 2 years after the release of the pack.
Looking at the sales of Planet Zoo and the active player base, there's no economical reason to update the tapir at this point. There simply isn't, because there simply has not been an impact on the economical side of Planet Zoo that would warrant that change. If it would have let to massive drops in sales or if the pack wasn't profitable, then they would have been forced to take action; but no matter how much people want it to be different, it clearly isn't the case.
But, of course we all know that it isn't just a financial relationship here. The credit we have isn't only financial in nature, there is also a form of social credit that becomes part of this. Frontier clearly knows this, and worked on building a long lasting relationship with the fanbase by listening to what we want and build up social credit through giving us what we want. That gives them a financial advantage too of course, but all of these things are interwoven. And importantly, this social credit isn't build by the higher ups; it is build by the people who spent their days going through these forums and pass stuff onto the teams, it's by the dev team, it's done by the people we directly and indirectly communicate with as a community.
In return, as every relationship is two sided, we also are able to get social credit as a community. If we'd act like a collective bunch of jerks every single time, then it would be incredibly hard for the people who work on that relationship to do that very thing. Which is absolutely logical because people don't turn into soulless robots when they start their working days. Act like a jerk, and you'll obviously see the consequences of that. By being constructive, by giving positive feedback when there is a chance to, by not acting like jerks, by participating in events we as a community also build our social credit.
So returning to the updates and changes, if these have no financial reasons for them to happen, then we're not buying those with money. We're buying those with social credits. Frontier going "alright, let's update the rhino" clearly comes from the fact that we as a community asked for it and we've build up the social credit so that these issues get prioritized in the time they have for it. Because at least from the early statistics this pack was not a financial failure so there was no economic reason for it.
And that brings us back to the issue at hand. If we want Frontier to keep prioritizing these smaller visual changes in the time they can spent on DLCs in future DLCs, then bringing the tapir up every single time is going to backfire. Because of course that is going to come across as "good you did the thing, but now do this next". It's going to backfire, and it's going to end up leaving a negative taste in the mouths of people who work on it. Chances of this being passed on as a high priority will get lower, in favour of other things that will cause less of these discussions and you'll end up achieving the exact opposite of what you want. No matter how constructive you phrased it, you're going to come across as ungrateful.
I think there's not a single person out there that thinks the feedback on the Malayan Tapir is invalid or that people have been utterly unconstructive about it. It is much more of a "time and place" kind of thing. It's completely fine bring it up once and a while to show Frontier that it is still something that the community wants and as long as it keeps being done in the constructive fashion the vast majority of people have done it, that's 100% okay and I don't think anyone would really disagree with that. But bring it up every time there's an update or every time that Frontier does respond to the feedback on other animals, you're going to achieve the opposite of what you want.
By all means, I hope we can still have the social credit by the time Frontier reaches the tapir in terms of their backlog. I hope that the devs don't go "you know what, whatever we do, they will just demand this for another animal next and be angry about that" and prioritize another issue. I hope we one day we'll get an updated version of it. But I strongly believe that can and will only happen if we as a community create an environment for that and I don't think we're doing that if we go through this cycle with every (visual) update (an animal receives).