This is probably controversial, and yes I know balancing them will come later - however, if this isn't removed early on, people will have already built for it, and "the damage is done". I would argue that entity-internal transporting should not exist at all (not even with chargeup times, power costs and shield drops, which isn't even happening with same-entity teleporting right now). Entity-to-entity transport should naturally stay, it has it's uses.
The first steps towards boarding...
Transporters: no transport on same entity
The first steps towards boarding...
Transporters: no transport on same entity