Jens Schoenfield at Individual Computers has spoken of his differences with Mike from Cloanto. He doesn't support 3.x at all saying Mike is too brutal an approach - "We are a creative community, don't break it"
On the other hand, I have a 3.x A1200 setup aside from my 3.9 A1200 and it's a clean an sharp environment - so whatever.
This quote from the Cloanto site says 3.x systems need workbench.library on the boot disk as it's no longer in rom.
"The 3.X ROMs have a size of 512 KB, and are therefore compatible with all Amiga models except for the Amiga 1000. In order to make room for the enhancements, the 3.X ROMs employ the same technique used by Commodore for the 4000T ROMs, i.e. ROM space was freed by moving workbench.library out of the ROM. This means that a "Libs/workbench.library" file must be present on the boot disk, as detailed below."
https://www.amigaforever.com/kb/16-125