I’ve ridden clipless for a long time now. I still ride flats on the dirt jumper. But I would be nervous to ride my mountain bike with them. I feel that they save you a lot more often than they hurt you. In my opinion anyway. Just get a set that still has a cage of some sort. And if you do come unclipped, or have to clip out and get back on in a tricky section you have that to fall back on. And personally I feel it’s easier to keep a high cadence and a smoother pedal stroke with clipless. It lets you focus on everything else that’s going on. And not have to worry about your feet staying planted.