I really do want to be positive; I dislike pointless forum whining, and I'm disappointed in myself for the extent to which I've participated in it. However, that doesn't mean all complaints or worries are not legitimate.
I have a love-hate relationship with metagaming. I really LOVE metagaming things. Getting an extra edge because you've put in the time and effort for proper planning is something that makes me really happy. But at the same time, maybe in part because of that, I realize how much metagaming can ruin a fun game and how limiting it can be.
And I really hope we see some indication that FD is seriously considering how much extra strength a strong healing ability can give to meta-focused setups, and the degree to which that would inevitably influence the rest of the game.
Granted; we don't know much at all about it at this point. But my fear is that if it's a enough of a heal to please those who really want space-clerics it is inevitable that it will end up with a new meta based on having healers, and it almost inevitable for that meta to be very powerful against those not toeing the new line. If it's not strong enough to result in a new meta, everyone who really wants space-clerics is going to feel cheated.
I'm not worried about changes. I'm worried about unanticipated swings in player mindset, requiring swings in design to cater to that mindset, brought on by changes. Especially when changes are made not fully considering just how thoroughly metagamers can and will meta their game, and how all their theorycrafting inevitably bleeds out into the playerbase at large, changing the game for everyone.
Metas will always exist. They are not the problem. Their relative strength is. That is what needs to be kept in mind and mitigated when designing, and "healing" is such a powerful concept in a combat-heavy game, it really requires very careful consideration, especially when it's added in after the fact.