Wires get stuck all the time, and the way they try to get over it is have lubricant on them so the spooling doesn’t stop.
However, that doesn’t mean the wires wont get stuck/ break or plain get jumbled if you try to scale these weapons.
Fiber optics are “slightly” better due to diameter than normal wire guided systems but at the end in any foliage environment or otherwise this gets difficult.
So it’s a question of having both options - RF and Fiber or knowing limits.
It’s not like these are being thrown out in the thousands like the usual FPVs and a 7km spool of Fiber optic is not relatively cheap either.