I kind of wonder if you and OP are talking about significantly different scale in amount of code/functionality/team size.

Perhaps I am just jaded, but I take it for granted that writing application logic is only ever going to be a significant minority of “your time”—in larger orgs there are teams specializing on the different monitoring, platform, infra, etc taxes that are a reality of running software at scale.

Five smart hackers that know aws and python well are going to get much further on lambda-all-the-things than an org of several thousand would, probably.

Lambda is also outrageously expensive at scale; but at the end of the day I’d chalk this up mostly to “OP not very good serverless compared to other patterns, fivea good at serverless”