My major gripe is that I legitimately need cross platform build and test (windows, Linux, and macos). I will pay hundreds to thousands of dollars a month to someone that solves these problems (I already do, and release engineers aren't hurting!).
I spend a lot of time and money on build automation because nobody has solved it for cross platform builds, and I see forcing containerization of key elements into backend services as an insane solution to that problem.
That might make it not have value for you, buts fundamental to the reason that those who use it do find it valuable.