You’re coding safety critical systems and depending on severely non-deterministic tweaks to GC to get it to run right?! Where is this for? (Just so I can avoid it)
The biggest issues are that an engineer with the knowhow is expensive, a team of them is prohibitively expensive, a lot of companies outsource this work to different countries and make them sign onerous and dubiously-enforceable contracts, pay little, demand too much, and have incredibly unrealistic deadlines for the type of work that needs to happen.
You know how it is, if it never fails, you're throwing money out. That's the mentality of a lot of management types I've dealt with.
That's certainly one way to look at over five years of engineering effort, extensive systems testing, countless hours of automated regression test development, independent product quality verification, rigorous code reviews, risk assessment processes, mandatory four 9s call quality requirements, integration analysis of JVMs with deterministic GC, and so on.
Judge not a galaxy from a single star.