Y'all must be talking about some other builders or their storage shed / work shop type buildings or converting a work shop / storage shed / barn into living space.
Both Lelands & Ulrich and several other off site built cabin builders use normal framing methods on all their cabins
that are designed to be lived in and are very well built.
I know 4 families that have them and one couple that have 1 larger main cabin they live in & 4 smaller they rent as vacation rentals.
Don't take my word or anyone else's, call them & ask how they're framed, watch their construction videos, go see them in person, ask for a tour of their construction facilities.
6 videos --->
Lelands behind the buildDefinitely worth your time to go see for yourself if your trying to decide between site built stick frame / mobile / manufactured / modular or pre built cabin type.
Site prep & foundation considerations are probably the most important factors no matter which way you go.
Both you mentioned are very familiar with various methods of site prep & various foundations.
All said & done they aren't less expensive, built in a controlled environment with consistent QC, less weather delays & material damage from weather conditions during construction.