I’m running 1×10 in the Peak with a 33-tooth chainring and 11-36 and it’s fine 99% of the time and 100% of it when I’m feeling ‘ard. About once a week, when I can’t be arsed, I’m tempted to go to a 32. Using a Surly stainless singlespeed ring and a cheap Superstar top chain guide thing on the BB and haven’t had any chain-dropping problems.
In a way, it’s pretty straightforward: if you’re someone who rarely uses the granny or the big ring, then 1×10 makes sense. If you’re forever spinning up hills in tiny gears then 1×10 is maybe not for you, or not round here anyway, certainly not with a 36 up front, but then you may well be much stronger than me. But if that’s the case you probably won’t be spinning up hills in the granny anyway…