> Logs are structured and passed to a SaaS which will have a custom search syntax that takes tens of seconds to search them poorly, and they'll get lost in the noise of all those components. You'll spend a non-trivial amount of time devising systems for tracing requests through all these components.

I feel this one. At a previous gig we had an entire project to try and pick a logging solution, and none on offer let you do the one fundamental operation that makes using logs bearable; full text search.