My take on why people prefer single output for most situations boils down to two reasons.
1) Keep It Simple Stupid aka KISS
Let’s say all of ones weapon lights are bright single output and press for momentary and click/twist for constant on. Then let’s say your weapon light fails or the battery dies, but that’s ok because your edc light is the exact same setup.
You can always adapt and find items or ways to make a bright light useful but you can’t make a dim light brighter or throw farther. Downside with bright single output is battery life.
2) Durable, reliable, and proven
Multi function multi output lights have come a long way and most are of equal quality, but most people would say that a single output simple tail cap is the most durable and dependable type. Which I would think is why almost all weapon lights are this type and why most people suggest these for hard use.
Personally I am a big fan of the 2 is one 1 is none mindset
I carry a surefire or streamlight tactical high only and an olight s1r baton
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