I've played top like 3 times so my opinion doesnt really matter but
Literally wtf are you supposed to do against Nasus if you aren't
, or maybe
if you get lucky?
Every game (im mid 85% of the time) it doesnt matter how fed me, my botlane, or both of us get, if Nasus isnt 0/8 by 20 minutes the game is basically over.
Put him down?
.

should dumpster him, as you mention ranged champions can heavily harass him before he maxes his Wither, after that its pretty much over for them but then again Nasus should be late game. If they ever get strong again (I pray every day to all the gods that they won't)
and
can fuck him up rather easily.