Not my post, but I've heard the same concerns with Bevy as with the others. And the actual blog post linked by that post does mention Bevy many times.

Infact Bevy might be a perfect example of my gripe(s) with Rust. Completely throwing a standard object system out the window in-favor of ECS which still hasn't caught on in even the most used game engines like Unity hurts adoption and usability.

I thought Unity and Unreal were transiting to ECS? I was under the impression at least that Bevy was adopting what the industry was moving towards, not exploring virgin territory.

I'd very much consider ECS virgin territory. DOTS (ECS) in Unity has been out for 5+ years with little to no real adoption. I'm unaware of any pretty much any use of ECS in Unreal (I think what exists is mostly focused on internal graphics / animation, not gameplay).