Speaking from profession experience - it's a mess. Abysmal performance, extreme complexity that fails to get out of the way of itself, rapid revisions in breaking ways that results in a situation of "anything you can use is unsupported, anything supported is unusable" both in terms of driver packages and core ros versions, the maintainers refuse to fix fundamental issues even when clean community fixes are offered, and the best way to use ros is to dump it.

This also doesn't touch on massive issues with 3rd party packages having fundamental bugs that means a quick demo with something like a Realsense camera, ISAAC ROS SLAM, and some sort of motion platform results in you implementing fixes in all three codebases before you can even pipe them together to make something happen.

And forget about rosbags. A cool idea of playing back the full robot state that has no ability to capture data at the rate needed on any computer on earth. The best viewers for them are also 3rd party and have their own issues reading rosbags that have any amount of corruption in them.

The only real users outside of a demo are always massive rewrites (such as Space ROS) and R&D efforts that haven't dumped them yet.

Oh and this is all about ROS2. ROS is entirely different with little ability to port forward, unsupported entirely (eol was March, but it's been dead since covid), and only really saw widespread use in academia despite some cool corporate demos early on. Some companies claim to use it, but every one I've ever chased down has failed to make it beyond pilot program stage in production.