Having just played a bunch of the 4.9.1 update modpack as Romans, I really like the current way the villa and figs work. The rest of the bonuses I can take or leave, Fornix is more interesting than the Coliseum was, Ballista and legionnaire are cool and have been in the game forever, but legionnaire is often limited by lack of iron and ballista currently isn't that unique. If they were going to replace them with something, I guess you could lean into the auxilia. Interestingly, Roman cavalry for most of the republican era wasn't awful (winning at Heraclea, although losing at Cannae), additionally in the late republic and Empire Roman citizens often joined auxilia cavalry units to have the opportunity to marry non-citizens and these auxilia performed well, so there wasn't an inherent substandard quality to the cavalry. However, given Rome isn't known for cavalry it would be an odd choice for a cav unique being Equitatus and not a more mercenary auxilia representation.
Anyways, I like the civ as of 4.9.1 and am fine if it doesn't get that many changes, although as always I will note I mostly play on prince/warlord against the ai so the fornix isn't that hard to get a few early when I have iron.