Hmm...not sure I agree with all of your points and the added complexity, particularly where you suggest having a set of balanced rigs to reuse.
The balance of the volume, although the point of this post, is to me the easiest thing to set, takes seconds, so no idea why you would invest in pre balancing the volumes, especially when there are many other factors which could override that. For example, you may want one sound quieter for certain sections, or louder to boost for riffs, so you will end up editing them anyway. Also EQ is also as impactful and volume...
1) learn what clean sens does as others have mentioned. This is only necessary if you want to switch guitar types on the fly and balance them. I have never touched mine and never needed to. If you stick to your point 7, its hardly a big overhead to match between rigs using the volume.
3) Make necessary adjustments to the amp volume not Rig volume. The benefit of adjusting the amp volume as opposed to Rig volume (and saving the browse mode version this way) is that should you have a Rig in performance mode where you have dialed in a bunch of effects just so for a particular song, but then decide the amp doesn't suit it well, you can replace the amp in the existing Rig. If your replacement amp was volume balanced already, it will be volume balanced when you plop it into a new Rig. That is such a niche case, the overhead of saving it just to retain a set of balanced rigs. Just not necessary.
5) solo boosts. Most guitarists only have a need for different volumes when soloing. Having an EQ in the X slot is again beneficial. Since it has its own volume control, you can make that adjustment here when you want a solo boost, which also gives you the option to toggle to volume boost. Then why not either morph volume or have a separate slot. Selecting an effect is slightly hard tap dancing wise and you take up a slot. This emulates the old trick of having an eq pedal in the effects loop to boost for solos ( I did it with my old Laney) and it was always a work around because I didn't have selectable volumes. TBH I also add more gain and a touch more mid and presence, so having a slot dedicated is way easier IMO.
7) Limit the number of profiles you use in a gig, regardless of how many performances you create using those profiles with song-specific effects. Your core tone, the profile and overdrives pushing them shouldn't be different for every song. Have a set of profiles that give you the gain stages you need. Maybe have a second set you like better for a different guitar you may use. Maybe even have a couple others that do whatever special thing you need for a specific song. But it's hard for the sound tech, the band and even yourself to constantly have your core tone changing. Totally agree with this! I learnt the hard way with this.