Double Zero:
One "day one" the P1127 was a VTOL beast. The undercarriage layout built into the P1127 from the day the engine got a second set of vectoring nozzles meant that a fairly low fraction of the current Harrier's weight is carried (on the deck/ground) by wheels that actually have brakes on them. Thus the braking performance is rather feeble compared to more conventionally arranged aircraft and also the F-35B. So the rather fundamental differences between Harrier and F-35B might mean that not every "truth" about V/STOL aviation as we have come to know it is directly applicable to the future.
That said, more than one Harrier has done a full-stop SRVL when the situation demanded.