<<< has developed a way to use the subdivision surfaces by building the control cage directly in Moi3D

yes in theory! :)
here only with _SSPlit, _SSscale, _subdiv_beta9, by Max Smirnov + Extrude SetDirection ;)

You can put them in ShortCuts: for me its P = _sSplit, S = _sScale, K = __subdiv_beta9 but you can make anything you want! :)
(B= _sSBridge, E = Extrude Setdirection (native : write the previous) cool for Hard Surfaces Modeling ) see Bulgarov Moi Video ;)
and for Extrude face(s) in subdivision when they have special positions in the yet Sub Boxmodeling object)

with only these 5 ones you can make theorically anything...in Moi! :)
see this thread: https://moi3d.com/forum/index.php?webtag=MOI&msg=9689.1





Vitaly Bulgarov Video!
https://www.instagram.com/p/Bq9qyZ5B2V4

If you want some practical real theory of SubDivision modeling concepts see the marvellous site of Arrimus! (only videos)
https://www.youtube.com/channel/UCSLLdTBwLMfTKWS56tOiQpw
It's also a Moi Master! ;)