We are 50+ years down the road from Spey's etc...
Also aircraft like the Buccaneer or F18 do not have the weight problem of the F35 'B' !
Any added weight is a problem for any aircraft but it is a crucial area for the F35 B
Also - historically blade rubbing might be viewed as a problem during 'enthusiastic' handling - but unless I have misunderstood - the blade rubbing on the F35 happened whilst being flown fairly sedately !