I'm always on and off the lock out. But then I know how to climb hills efficiently.
I've got a handlebar-mounted fork lock-out on the hardtail and used to use it for steady smooth climbing but once the novelty wore off I found it didn't really seem to make much difference. For rocky, technical climbs I actively prefer the shock to be working to help keep the front wheel grounded for better control (ie not bouncing off the rocks).
As for the dropper... depends on the terrain. There are some trail centres where they're a no brainer, but for most riding it's a bit of a waste.
Yeah, for uplifts and pure descents at trail centres I can understand the use, but to me that's not real mountain biking. That's BMX for grown-up Power Rangers. I like to pedal on my bicycle.
Dropper posts are incredible on the mtb, my descent speed has gone up significantly and the bike feels a lot more stable.
I just slide off the back of the saddle and hang my arse over the back wheel with the saddle pressed into my stomach, lowering and shifting back my CoG.
*shrugs*
I guess if you have a long top tube, short arms, a long stem, or a slightly oversized bike (or any combo of the above) then it might be hard to do this, but for me it's always been a breeze on any of the 10+ mountain bikes I've owned over the past 30-odd years. For me the added weight, complexity, maintenance and expense of a dropper post isn't at all necessary.
And if riders can't slide off the back of the saddle quickly and easily, then how do they cope with a sudden drop-off on a flat trail like this?
Surely they don't activate the dropper every time they anticipate a drop-off? I dunno, maybe they do. Seems like a lot of faff to me.