I don't dispute that... hmmm... put it this way, I wanted to avoid saying it, but you pushed and I slightly push back. Those covers you chose are not very flattering for Saito and Tsukasa. I know there's a market for that style, what you call "body qualities" I think it's close to "big booty" in US porn.Absolutely! But I often found the Saito and Shiori movies more satisfying as they focus on their "body qualities" more han Aimi's movies.
Anyway it's a known genre in AV too, body obsession or fetish, but I think it's a niche sub-genre. I don't think Aimi has a thing against it. But why any idol don't do any particular genre, (except the obvious hardcore ones like bukkake, anal etc) I can't say, of course.
Well... I just had a glance at 2017 vids of both Saito and Tsukasa, I mean I do have a couple vids of each girl but mostly I don't follow them. And it seems... Shiori Tsukasa isn't really more successful than Aimi, dispite having more solo vids. But Miyu Saito... I'm with you. She does many different studios/labels/series, and mixing solo vids with duos (TKI-057) and planning vids. It would be so awesome if Aimi's career is similar.You are maybe right, but damn, I don't think she is engaged in shooting HUNTA and AP more than 5 days a month, why she do not shoot BOTH?? They would mean more money, after all. And more solo releases also mean more exposure, which generally leads to more work requests and more money.
Anyway... there is probably good reason most idols (not talking about Aimi specifically) don't shot AV 15 days a month. I think the market can't support that much sex scenes from one girl per month. Every so often you see an idol goes kind of nuts, e.g. Meguri earlier this year release a planning or solo vid like once a few days for several months straight. And then... she retires.
Most idols also "work" (self-promote on Instagram) and make some extra money doing fans and commercial events. According to a Taiwan report, she recently found that her popularity in Taiwan is better than in Japan, so she might be doing more and more gigs outside of Japan (sadly most of us can't enjoy those).
Also from what we know of Aimi's personality, I suspect she's also making money in some very secretive jobs. It's even possible, she's letting her AV career slipping because she's making so much money in these secret jobs.
She already made very clear money is the ONLY thing she cares about. Unlike many idols, who cares about fame or fan devotion or friendship with co-workers, or some other ways of self-fulfillment, at least so they claim, as required for every idol.