This is an excellent framework to validate a low-code/ full-stack frameworks as ERPs are complex beasts. I would like to also add( especially for opensource low-code frameworks ):

#6 Can it generate pdf and excel reports

#7 Does it support scheduled jobs/tasks

#8 Can you choose to execute logic in the backend ( this does not seem to be the case for retool etc which only support frontend js )

#9 Can I extend with my own js, css and backend libraries

#10 Is it horizontally scalable and stateless

#11 Drag and drop ui builder that is not hard-coded to a single css framework and that generates code that can be modified.

I have not yet found any low-code framework that fits into these benchmarks

Check Dronahq.com it does most of the things you highlighted

1) frontend app building (responsive) 2) backend logic builder with automation and BPM 3) pdf gen 4) add your own js, build your own controls

Disclaimer - I work at DronHQ

What are your top frameworks that satisfy all of these (assuming developer productivity is a factor)?