I’m using 1×9 on my HT (Renthal 34 – XT 11- 34). I find it works fine for woods, no trail centres around here & I don’t drive. Woods are fairly hard work, the trails I mean, they’re quite rocky & rooty, upy downy.
I had to change my riding style for up hill work, standing on everything. I feel stronger for it too. With the weight I’ve lost off the bike & the look being cleaner I think it’s a good move personally. If you love to sit & spin then I think you should stick with a granny ring though. If your local/frequently ridden hills are more that a 5 minute climb then stick with 22 tooth… 😉
I should also point out that I use Egg Beaters & I’ve used Flatboys. I’ll keep clipped in because I can generate far more power that way by push pull in circles, makes 1×9 far easier.
Peace.