While I do agree with you to an extent, I don’t really agree that the Emperor needed to look more like he did in ROTJ than ROTS.
He doesn’t look nearly as different between '04 ESB and ROTJ as he does between ROTS and ROTJ.
His appearance changes in pretty much every film he’s in so it isn’t really too unbelievable that he would look different from '04 ESB to ROTJ.
At the end of the day you have to remember that the SE from '04 onwards was altered to be more familiar with the PT (like it or not, that’s not really relevant), so it makes sense to an extent to give the Emperor more of a ROTS look.
Personally I think it’s a decent hybrid between ROTS and ROTJ and while the original may be more interesting, that doesn’t make the quality better.
Nostalgia is obviously a very big factor, but while someone may personally prefer the aesthetic of model ship battles in ANH, it’s not really subjective that the ones in ROTS look objectively better, which they should, almost 30 years later.