I'll argue that, at least for SU and to some point USF, that the changes are not a redesign as the role of the units are not changed.
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This is my personal opinion and you do not have to agree with it:
Soviet faction design (imo) was to have average stock units and very cost efficient call in units.
5 stock units come out better from the patch (+1 doctrinal), that imo is redesign because SU depend allot less in doctrinal units to fill the Gaps.
USF faction design (imo)had them with most cost efficient mainline infantry (and some other stuff like best heal/FRP)and the least cost efficient support weapons. Buffing the HMG, introducing a mortar (that is better than wer one and some other changes)imo redesigns the faction allowing to play defensive game with support weapons.
OKW are all over place and I can't really see what their design is after the patch that removed FU penalty...
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I call these change faction redesign ,you can call it something else, it is not really not that important.
The point I making is that all these changes will have a very serious impact on the game, and will probably take several patches to smooth out imbalances.
I also doubt that some of them will increase diversity, for instance for the OKW I suspect that instead of volks and PF blob you will volks and SP blob...
The other road, of fixing long term issues, can actually help with diversity allot more imo, it is easier, safer and will yield result faster...
For instance Guards saw many balance changes and remain underused but it was the quality of life changes (more responsive, weapon drops) that lead them to be used more.
If the issue as stated in the patch noes is diversity and not balance or bad faction design trying to increase diversity with so drastic changes is imo like trying to kill a fly with sledgehammer...