Childish and off-topic bickerings aside... I am one of those who "can produce" (aka dev/software+devops/platform or whatever you want to call it - I don't consider QA a role anymore, topic of another convo if you want), and I can tell you a GOOD, sane engineer or a couple of them can make up for a team of 5 or 6, depending on the scale of a system and/or its usage patterns. No need for any of that fluff.
Heck, I run my trading system (not HFT, positions are held for days/weeks or even months) off a single EC2 instance in AWS for now and I even run the observability stack on it (no long-term metrics, I don't [have to] care).
Appreciate HFs and big corps have diff requirements and may need more systems in place, I work and worked for them and boy the waste that's there.
It's good for the people that can get a paycheck, but there's also a ton of waste, IMO.