>>715702912
You need to keep in mind that scenes like this take away time and manpower from other scenes, the more shit they have to do like this, the more scenes with almost no animation or reused animation end up being used to fill time and pad shit out.
I'm not against higher detail animation, but the major benefit of lower detail designs is that you can have higher quality animation more often rather than just in major battle sequences in one or two episodes a season.

Again, there are pros and cons to both styles, but you're basically asking for every episode to have movie quality animation which would be cool in theory but would also be prohibitively expensive like 99% of the time.