I compared M60 and M61 extensively...
M61, at any square inch of its hotspot, is dimmer than any other square inch of the M60 hotspot. In fact, M61, at its brightest point is about equal to M60L, but has a much bigger and more useful, truly huge hotspot.
I EDC'ed M60 x 18650 then didn't like the runtime that much, moved to M60L x 18650 and like the 4-hour runtime, and now find M61 x 18650 most useful. In 2x18650 configuration, I think I would prefer M60 but the way I actually use it, M61 is what I want. Thus M61 is my current EDC.
I tried M61 on both 1 and 2 cells and didn't notice any difference. This is not the case with M60 as you can clearly see a difference between 1 and 2 Li-Co 18650 cells. That difference amounts to probably 40-50 lumens.
I think 80% of the time, M61 has a more useful beam. And the remaining 20%, M60 is more useful.
I used to think like you, that outside M60 is more useful than M61. That may not be the case, as M61 has a bigger hotspot, highlighting more paths through a dense forest, giving you more options, which route to take.
M61 has a decent runtime, but not impressive. Just good enough, but still motivates you to bring spare cells. When I run a "L" configuration, I don't bring the spares.
Wanting to try M61WL or M61WLL for the best runtime.
Both are lousy throwers outside, with M60 marginally better.
M61 doesn't really obsolete M60, the new Hound Dog does (But it's not a true Lego)