I liked SS when I has an SS bike, but for most of my riding it would limit me a bit, I won’t deny that gears can allow you to act like a jessy a bit too easily on occasion, but then being able to moderate your output using gears on a long ride can also help you keep a bit in the tank for later..
It’s easy to say MTFU but everyone has a level of fitness and many have limited opportunities to improve it, I found riding SS was only any fun so long as my fitness could keep pace, once your beasting yourself up the 15th climb of the day, you’re flagging and you know it won’t get any easier then it looses it appeal a bit…
Having said that I can see me building a new Rigid forked, SS winter MTB just to minimise maintenance, should still be good for local loops in the cold, the extra effort on climbs should warm me up, not having to worry about wearing out a pricey drivetrain is a bit more of a motivator to get out and ride on a grim day…