I went down this road recently - and I am still there. I started riding SPD clips in 1992, and have no problems clipping in or out on SPD or HT pedals. It's automatic. (CBs are another story).
A few weeks back, a few of us were planning to hit Joplin. I had only ridden it once - three years ago in fog and freezing drizzle. I remember enjoying the challenge, but I also remember struggling to keep my Sidi Dominators functioning on my XT Trail pedals without clipping in. Since I was in new territory, under extremely challenging conditions, I needed semi commitment to my pedals - not full locked-in commitment. The sole of the Sidis offered no purchase on the pedal body - nor was it designed to. Clip in or slip.
This time, I was going to try it on flat pedals. I bought a set of Spank Spoons (concave body, pins adjusted/replaced from the underside, no bearing bulge to stand on, etc) and went for a few practice rides on my Megatower on my local trails. I had never ridden with flat pedals anywhere but Fontana DH and bike parks, so riding up hills would be a new experience.
First thing I noticed riding up hill was that it was no big deal. Even though my 5 10s Impacts are more flexy than my 5 10 Kestrels that I use with clips, the large platform under my foot provided plenty of support for my pedal stroke. Going up Santiago Truck Trail (STT), I didn't notice any "loss of power" from not being able to lift on my pedal stroke. What I did notice was I was never quite satisfied with my foot position and it was a bear to re-position my foot to find the right spot.
On fast bumpy descents a-la Rock-It, I did notice a slight decrease in confidence on my first run or two, but that has disappeared. On my first couple of hucks to flat (bottom of BVD, Stairs) I thought twice as I approached, but had no problem executing. On techy climbs I had a little trouble, and flipped my pedal once or twice. I think clips win for techy climbs, until you need to get out - and that's where they are most dangerous - when stalled and falling backward. Right
@buggravy?
I won't go run by run to discuss my learning curve. Bottom line is, I was very glad I rode with flats on Joplin. I started off pretty tentatively and the flats allowed for a quick, shameful dab here and there until I found my groove. After that, it just felt good to not be attached, even though the impulse to dab went away and I stayed on board.
Fast forward and I am still riding with flats. I'm about 7 rides in. I did switch to my clips for my double Luge run the other day, and loved it for that run. Then the next day I went back to flats for the added margin of "don't want to go to an ER right now." I would love to go do some repeated jumping practice - since I suck at jumps anyway, but perhaps I will leave that for a post-Coronavirus world.
There is a different feel to how you ride your bike when using flat pedals in rough terrain. A certain flowiness that you have to develop - and I really like it. I don't know if I will be a total convert to flat pedals, but I am going to keep using them for a while.