The huge perceived advantage of JP233 in the procurement period was the prospect of reducing the OTR (over target requirement for a set probability of achieving the damage required) from hundreds of aircraft to tens. Bear in mind that one of the pre-JP233 options favoured was long toss with 1000lb dumb bombs with variable delay fuses, and one does not need to be a weapons expert to realise that many hundreds of attacks would have been necessary to achieve a reasonable probability of closing an airfield for even 24 hours.
Yes, JP233 made tens of aircraft highly vulnerable, particularly around the target but that was perceived to be much better than making hundreds vulnerable and maybe not achieving the objective due to lack of resources.
Interesting to note that this weapon was among the first procured to take the place of the dumb 1000lb bomb of WW2 vintage but many regretted the lack of flexibility in the new weapon compared with the old. Change the priority from airfields to bridges, for example, and all aircraft needed rearming. It was also hyper-sensitive to target construction and dimension - the craters were only just big enough if the concrete and sub-structure were similar to the conditions assumed. It was also sensitive to crosswind - too much and it would not penetrate at all.
Perhaps the most significant fact of its' procurement was that it marked a shift in the head-shed thinking - prior to that a weapons system just had to look good at airshows and there was, apparently, no need to spend money on weapons.