It's percieved wisdom.
Last week I and a pal went to Cannock Chase.
A 26er HT would be the weapon of choice IMHO, although I was on a 4in FS. He was on a 4 or 5 inch Scott FS.
Now said frined has it in his head that more suspension is everything. His skills are ok, his fitness is poor, he wear all his clothes every ride & wonders why he's overheating, his ride- knowledge is poor.
His comment: "I would like to do that again with a 6 inch travel bike"
Now STW is missing the icon: "head. bang. wall"
But that's what I have been trying to ride out of him, that a HT is the best choice for most trails unless you are injured or are taking on black grade trails.
But he doesn't get it at all. It'd be lighter and therefore easier to ride too, but no, a 5-6 inch FS is everything he really, really needs.
This then travells downwards, so his 9yr old son has a 32+lb FS kid's bike. Lunacy.
Head. Bang. Wall.