I replaced my left 1 off eBay 30 shelkels and i haven't noticed anything with it.
I think they are non direct drive and have lots of 'not in park' sensors or something.
You can move 1 above the other and then when you press wipe it goes up, waits for the other to sweep then comes down back to where it goes
after you madame
Also the wiper arm has a segment block which limits its movement min and max but i see no evidence that it actually hits it
Also have you noticed on intermittent the wipers don't go all the way down they start about an inch up, turn them off and then they settle to the bottom.
Blows my mind tbh.
56 350 2.2 130ps mk7 with 2 side doors
65 290 2.2 125ps custom with 2 side doors
07 350 170ps
Ids v86 licence + v86.04 update + xprog
hereIds map
here