A tech grade of 7a is entirely and completely meaningless, so I have the same problem with something being graded E4 7a as I do with something being graded E4 Jellyfish.
This has made my day.
Otherwise, the thing to remember with trad grades for micro-routes/ highballs, is that BOULDER PROBLEMS DON’T GET E GRADES. So if the main difficulty on a micro route is a boulder problem, it has very little bearing on the overall grade. Reasons to put WSS up to E5 would not so much bear on the boulder problem, it would be if there was no jugs, no rest, no easy opportunity to traverse off, or more likely a worse landing. Look at The Art of White Hat Wearing for example, which is shorter than WSS and slightly easier, but got E5 because the landing is worse. And if you think I’m mental, remember when the landing was improved, some people lamented the loss of a once proud E5!