Yeah. Sapper is not ready for prime time as a live server imho.
I use sapper for my personal blog and for my company. The work I do for my company is a heavily modified version that solved a number of pain points. We opened PR for all of them to contribute back, but they have been siting since October.
But we made a decision to only use it for static gen.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.