As mentioned by
@Hereticz they're based in Hong Kong. As far as I'm aware, it's the same people operating the production with the same quality and seemingly the same dimensions and style of slip, lenticular, package etc. The only difference I'm anticipating is a logo change and a different name on the sticker.
I too have culminated the entire MCU collection and I too wouldn't want it to change retailer. But considering I'm imagine the endgame release to look seemingly identical (aside from steelbook) from a Blufans release, I'm more than happy for that to be the continuation.
Blufans have changed style themselves of their spine number styles and the styles between stickers so it's not like another change along the line would be totally breaking the uniformity of the other releases. From the early MCU releases up till the most recent, theres a lot of variation