> There is no telling if it will actually save time. You could be messing with configurations, have to learn their docs, etc... Or future migration could be expensive in both time and money.

This refers to self-hosted / diy tools: you have to do them all up-front. Most SaaS don't require configs or deep-learning compare to FOSS. Self-Hosted/DIY tools also require future migration. Especially when the self-hosted/DIY tools did not capture future requirements due to limited vision.

> Custom is more configurable

Technically SaaS provides API which allows folks to stitch up a few SaaS-es to automate their workflow if needs be.