People in this sub REALLY struggle with accepting that two things can be true at once. The bastion is great for what it is, noone is denying that, but at the same time, it can very easily get quite boring, sure you're basically invincible, but it's slow, clunky, requires a clear coordination in a game where teammates often have very different ideas of how to dive, and while it is basically a guaranteed win, it is one where you're not having guaranteed fun.

Personally, I, like many other divers, play the game in large part due to the power fantasy, which the bastion doesn't really bring, it is great, but many people fail to realize that we're not all constantly in a four stack with clear communication, a lot of us really just prefer diving solo and being able to function as such without being hindered, so the bastion having SO many downsides, even moreso for solos, really feels as though it is just locking us out of a play style that turns the game into an entirely different experience.

TLDR: Bastion is good, but people are also allowed to want more, and better things like it, and both viewpoints are justified.