I agree with your points. But not all those seals or cats are common in zoos right? So "complete the small cat" set with one small cat from each continent - but I saw tons of people after we got 1 small cat that we no longer need any more. Same with the grey seal. There was a ton of backlash against the Dhole being too similar to the Dingo, even though they are from separate continents and do have different biomes.
As someone who originally disliked the dhole a fair bit, I can give you my reasons why I didn't like it exactly:
• it reused all the same animations as the dingo; it had nothing unique in terms of behaviour
• it felt like a bit of a wasted slot, considering how badly everyone wanted other animals from the region (such as gibbons)
• it just didn't look right. It understandably had the shorter, more vibrant summer coat, and that's not everyone's cup of tea but to me it was fine considering it was a tropical-based pack. The real problem was that the model itself was off, the snout was too thin and the proportions weren't right.
Luckily, this problem was fixed later on.
• this one is a bit more personal, but: it was the time when new species/non-replacement mods started to emerge, and to me at least it kind of felt pointless to get such an easily modded animal in a DLC. Of course I have come to the realisation that this is a rather stupid reason to hate on something, especially considering that I can't use mods myself.
In conclusion, now I am neutral to the dhole. I appreciate its inclusion but I don't really care too much about it, it's there but I never use it. I would love to include them in a future Indian or Indonesian zoo though.
My point is just that for whatever reason people want more bear variety than other animals...it's fine. I get it. Bears are cool. But I don't think the variations you've been laying out end up creating such a chasm of difference between "only 1 is fine" and "WE NEED THEM ALL".
As I have said before, I would have been fine with just five, heck even just four bears (polar, grizzly, spectacled, panda), but I see why people would want different bears. I feel like the question we need to ask here is: how interchangeable are they? For example: sloth bear, moon bear and sun bear are all found in the same overall habitat (tropical) and region (South/southeast Asia), but could you easily swap them out for one another? Could you use a sun or moon bear in an Indian themed exhibit, or a sloth bear in a habitat inspired by the temples of Indonesia? And would either a sun or sloth bear work in a more temperate setting?
Let's hypothetically ask the same question about rhinos.
Could you easily swap the black rhino out for the white rhino and vice versa? I'd say yes. Habitat-wise they're pretty much the same. While it can be fun to have variety, this is in my opinion the "wrong" way to have it. It just feels like different cosmetics of the exact same thing... While with bears, what species you choose can impact the way you design the habitat.
With all that being said, I still personally feel that eight is too many, but oh well.