Completely disagree if you work on low latency systems, or a high volumes of requests: functions are traceable if you need to in a crisis: plug a profiler, run like prod, see the hot paths.

Dev ergonomics explode the cost of everything and you spend your time trying to figure out what the hell is going on where rather than just... plugging the profiler and sending the input, then observe the internals moving around.

If the system can work without micro services, it should.