lol hitmontop can hardly beat most of the spinblockers in UU, it definitely won't be able to do it in OU. the most it can accomplish is foresight on the switch, which works for any spinblocker that learns it, but is a massive moveslot cost. in addition hitmontop will easily be worn down since the only recovery it has is rest. this is itself another example of the problem - there are precious few spinners that have the bulk to hold up in OU. dishcruel is infamously durable, but it's only that reliable in rain - it's probably one of the best choices you can make on a stall team though, really, so i'll give you that one. starmie doesn't fit on stall - it doesn't have the natural bulk at all and water/psychic is really not a very good typing when you impart pursuit and volturn weakness. the fewer psychics you run on stall, the better. donphan gets washed away by rain. forretress is role-overloaded and has no recovery. all the UU spinners are UU for a reason (don't even start on claydol). if a spinner has to come in repeatedly, it WILL die, and you have to be careful because if you use your spinner's bulk to wall things, it might die when you need it for spinning later. this is a problem for every spinner that lacks recover/roost/etc, except cruel.
we can look at spikers as well - really the only solid spiker, and generally one of the most solid defensive mons in the game in its category, is skarmory, who is overflowing with support options and bulk. forry has no recovery. ferrothorn is a bit unreliable outside of rain, too many things will be running fire coverage for it (in rain it's pretty respectable though). cloyster on stall is what we call a bad idea. deoxys-D is okay but the entire meta is gaming against it and it has hardcore 4mss. all the lower tiered spikers lack the bulk. and so on and so on