And actually, they did go back and do seasons 3-6 as well, but with a much less well known cast - that aired on Disney Channel Japan (well, technically, seasons 3 & 4 aired on an offshoot called DLife, but that’s splitting hairs - that channel had shut down by the time they did seasons 5 & 6). They also did the Best Gift Ever and Rainbow Road-trip specials. I believe it’s that cast that they used for the brief scene of the Mane Six at the beginning of A New Generation, as well as for Twilight’s appearance in Growing Pains.
Overall, it was competent, for the most part, but a clear step down from the original cast (for one thing, the new Celestia constantly sounds like she’s about to cry, and Scootaloo sounds wayyyy too old). By far the worst thing, though, was the songs - not so much in the main series, where they were competent but far too reliant on auto tune, but certainly in the specials. They must have fucked up the programming of the auto tune, because they were invariably horrible and discordant - do yourself a favor, and never look up “The True Gift of Gifting” in Japanese unless you want your ears to hate you for a while.
Speaking of the original Japanese cast, however, they did go on to dub most of the Equestria Girls content, from the movies to the specials to the YouTube shorts. Plus, they also did the 2017 movie. The only unfortunate thing with those is that, aside from the content which was originally uploaded to YouTube (so the music video shorts as well as stuff like Forgotten Friendship, IIRC), they did not dub any of the songs - so that’s the EqG movies as well as the 2017 movie.
But I digress, that’s probably enough G4 discussion in the G5 thread, haha