The difficulty of merged profiles is they are only useful to you IF you have the exact same cabinet for your on-stage usage.
Since most people may use differing cabs, I don't see where Michael can make useful Merged profiles is there isn't a consensus on what on-stage cab most people will be using.
Maybe for something like the Marshall 800 and it's 1960A cabinet this would be perfect. So I could see Michael doing on-off's for such situations. But if he uses the British speakers and you have the Chinese ones, ain't gonna work right.
See what I mean?