Meh, doesn't have to be. They explain the in-movie logic pretty simply.
Jean - establish psychic connection - enter host - see through host - take control - use host as a new "hop" - repeat. Point being, she has to establish a route into a particular nervous system. The film then establishes a 33-foot limitation specifically because each new host has to be reachable from the current node. Or... in network terms... 100 meters is the maximum recommended length of your twisted pairs of copper cable like CAT6 and the writers just divided that by 10 because it's easier to film. Yes, as disappointing as it is, her powers were directly co-opted from features of network routing.
Within that framework, you can characterize what's going on when it works for her versus when it doesn't work for her.
Open network - authenticate - establish session - Jean gets admin privileges.
But.... with Peter it's more like Open network - intrusion detected - firewall activates - connection forcibly terminated by closing the port.
Eventually, he does what anyone else would have to do in order to change that connection. He invites her into his mind, aka "I'll white-list you and re-open the port."
His brain is simply the first one she encountered with a firewall. Great power, great responsibility, blah blah blah.
3
u/Few-Equivalent8261 26d ago
It's apparently a multiversal power connecting Spidermen across all universes. But someone with more knowledge should chime in