I don’t think any large gifts I’ve ever given our boys survived their 20’s - if they aren’t super interested in it, it gets regifted, traded or sold. It does teach you to not be too attached to what they do with it. If I were transported back to their 18th birthdays I’d definitely focus on experiences or what they were into at that moment. I don’t think it registers in a teenagers mind if the gift is $200, $300, or $600, so I’d get multiple smaller gifts throughout the year rather than one big one, unless what he was into required the full amount.
We have had good mileage out of piecing rifles together - one part of an AR for Christmas, one for a birthday, one just for no reason, lots of ammo. The guns still get traded or sold, but it was spread over a few years worth of gifts. Honestly, 223 ammo is about the only thing they would for sure keep and burn up.
The same could be done for a western elk hunt spreading gifts out over time like camping gear, pack, tents, boots, bugles, bugle class, etc.
Tablets for mapping, knives, guns, pistols, tools, camping gear, all of it either traded, sold or regifted. Ex girlfriends end up with way too much camping gear. Lol
Good luck.