Our nonprofit has recently designed and built tiny homes with the IRC Appendix Q in mind, and intended to get sleeping lofts approved once this code is adopted in Oregon.
That said, the code, as written, will have a huge impact on getting THOWs approved because it manages all of the «above trailer» issues that THOWs are stuck with: ceiling heights, sleepinglofts, loft access, emergency egress and rescue, etc..