I generally feel like bad software will directly integrate APM APIs in their codebase, instead of outputting meaningful logging that APMs can consume.

And APM SaaS companies want this, because the engineers aren't bright enough to think, "Hey, what if we need to switch APM companies?"

So your B-tier engineers do it without questioning things, and your B-tier managers will complain to A-tier engineers that it's more work to protect yourself from vendor lock-in.

And now your org is paying 5-6 figures a month because some idiots couldn't append to a text file or add rows to a table using SQLite. And no one cares because it's not their money, and you don't care because no one else cares.