Always had my eye on the Oasis line. There's something about the apparent ergonomics that look precisely like what I've always wanted in an e-reader but just isn't there in any other that I've seen. The Kobo Libra only almost nails it; bummer, since it has a color screen.
In any case, Oasis firmware seems to already be capped and isn't among the models being sunset anyway, should I decide to try it out.
Want to follow up for anyone possibly taking ideas from my post (though I've already put in an order on an un-registerable Oasis) -- if I had a bigger budget, the Boox Go 7 (2nd gen) looks like the way to go.
In any case, Oasis firmware seems to already be capped and isn't among the models being sunset anyway, should I decide to try it out.