Exactly. In the olden days, when some Superchargers on key routes were two-bay, the risk of a 30-60 minute delay due to queuing/sharing power was arguably much greater (offset by less cars using the network). Bigger (8+) sites should smooth out and reduce the chance of a long wait as pointed out by
@GRiLLA . Plus I find the latest Nav updates which show stalls available/estimated wait time quite helpful and no doubt allows anyone with a choice of when/where to charge to wait/divert elsewhere. For many long UK routes there are now a number of alternative Superchargers and so far in my experience this has offset the risk of longer charging stops.
No doubt in the UK we benefit from lessons learned in high usage regions elsewhere in the world (California, NL, Norway). Supercharging continues to be several years ahead of any other rapid network and Tesla have consistently adapted to retain the excellent charging experience in terms of reliability and ease of use.