Great/Important Post! Thanks.
The problem is not only related to mega-features (Customer Account -or- Multi-language), but also to micro-features.
Anyway, webflow team Doing a great job.
MICRO example
Category post count (Useful? YES, Famous UI pattern? YES).
10 things missing on webflow Blogging system:
https://discourse.webflow.com/t/10-missing-features-webflow-vs-wordpress-blogging-cms-system/116739
About this:
I work on webflow a lot and it is very rare for me that the system crashes (Try to work on Chrome Incognito - also check your internet connection speed).