I really do not understand the need for these questions because a simple test you can do locally with different software versions and with various ZWO cameras will show the effect that I and others have been describing.
Have you already done that? what were the results?
Anyway with respect to specific answers:
#1 The cameras that I have, that are affected by current software, and that need recovery of their full potential are: ASI290MM, ASI178MM, ASI462MC, ASI183MM pro.
#2 I use high speed, and NO hardware binning, for all software brands and software versions. Camera slowdown occurs with current versions of ASISTUDIO and SHARPCAP in all camera models. That compromises its use for planetary use.
#3 Camera slowdown, when comparing current and older software versions, is also found when I do NOT use high speed (for all cases) or when I try with hardware BIN (for all cases).
#3 I need adequate drivers to be provided in order to be incorporated in latest version of SHARPCAP, the software I currently use.
And ending as I started, have you performed locally such simple tests you above required me to do, to confirm and acknowledge the existence and need to rectify the issues I and others have found?