I’ll wear Knee pads for some XC rides, on others I’ll pop them in the webbing on the rucksack to put on for that one scary descent… If I’m riding offroad at night I’ll always put them on, if it’s a gentle tow path ride with the missus/nipper helmet only…
But Body armour, elbow pads and full facer I only use for DH days where I’m really pushing a bit harder…
It’s all about percieved risks, if you feel you’re riding hard enough and expect to have some close calls then wear whatever you consider appropriate protection…
I normally assume when I see someone decked out in full armour at the trail centres, that they have worn that kit because they plan to fully attack the DH sections and maybe have a slightly more agressive “Flatout or Crash” mentality (possibly lacking in technique dare I say it), I’ll normally let these people head down the Descents first, better to catch up to, than be caught by them I find…
Some might snigger, but I think very few would openly take the piss out of an “Over-armoured” rider so just wear what you want…