Nasus- Why is he considered healthy?

Nasus as a champion i have felt for the longest time to be extremely unhealthy for the game. Laning against nasus is virtually just slow down his Ascension into the late game beast he is. there isn't a way to stop him from being so powerful. the best you can do is hope their jungler doesn't gank and let him get ahead. the other problem is that in a 30 minute game, a nasus with reasonable ability farming should have at least 200 stacks. a very well farmed nasus can get up to potentially 300-400 stacks at 30 minutes. there isn't much actual counterplay to him at that point, because he's built straight tank and that BOtRK isn't gonna do anything to him once he withers. The game i most recently played, i picked quinn top specifically against nasus to blind him and cancel out farm, while that as always only delayed the inevitable. Nasus then proceeded to stay top lane the entire game, giving me two options- Stay top and slow down his farm, or roam and let him free farm. Nasus doesn't have to actually worry about a team, because he is designed with the ability to split push forever, and so he does. I ended up stacking armor pen atop of a BOtRK, and it still proceeded to not really affect him since he can catch up to you after you've used literally every gap closer possible, and do more damage in one autoattack than you do in ten. Playing against him isn't actually a game, it's tedium, and his kit doesn't promote actual teamwork, it simply promotes staying in lane and ignoring the rest of the game. What makes him as a champion healthy?