I know it's long been fan speculation that the 0080 designs were meant to be modernized, stylized versions of classic MS designs. I believe this has been contradicted by official sources, but it's interesting at least that SD Gundam Mk IV does exactly that twitter.com/TomAznable/sta…
A lot of what we take for granted as fans probably had its share of controversy initially. @BJ Beauchamp
has shared plenty of Japanese fanmail contemporary to classic Gundam shows that cried out "This isn't Gundam!"
I think the Advance of Zeta suits have a really strong aesthetic but have largely felt out of place in the broader UC Gundam look past the initial Hizack and Hazel variants.