If I intend on experiencing end game content like bossing, would it be a waste of time to level up an unwashed assasin or bow man?
I know this sounds cheesy, but as long as you're having fun it's not a waste of time. I keep telling myself that I should HP wash, but if I look at it realistically, I've never even reached lvl 155 (not even in post-Bigbang EMS), so I'll probably never do horntail anyway, and if I do, it will probably be only once for the pendant, and I could just get HB for that. So in the end, you have to look at yourself realistically, do you expect to do horntail regularly? If so, you should probably HP-wash. If not, you probably shouldn't.