Why do you say half?Not all, but about half the N. American Tesla Superchargers will be available to Ford customers in early 2024.
Tesla is making an adapter (NACS to CCS) for Ford that goes into production early 2024. The next year, Ford switches new cars to NACS native.
Fragmentation though?All they have to do is enforce that any "right-handed" charging vehicle connect in the vacant spot farthest to the left. That way, only one extra spot is taken regardless of the number of "right-handed" vehicles at the sight (could enforce this in the "App" by telling the Ford driver to connect to Charger #1A...)
Having 1 empty charge spot will not reduce overall site throughput for smaller locations (ie: 6-8 connectors) because the limiting factor is the site's grid power feed / transformer size. Smaller sights w/o megapacks do not have enough peak power capacity to support more than about 4 sessions at 250 KW. You'll end up waiting to connect, or charging slower if there are more connectors. The limit is the same, as should be the total time you'll spend at the SC location (waiting+fast charging vs. slower charging w/o waiting).
TL;dr Elon's team has got this. Don't worry, be happy...
A Tesla can't park where a Ford is and can't use the pedestal that a Ford is. Double sided parking with a narrow island would give 2 possible spots per pedestal. Left hand on one side, right hand on the other.
Tesla is already addressing this via longer cords with a more centered origin on the new pedestals.