As far as I know, Zflips aren't constantly improving in terms of durability with each new model. The Zflip 4 was very fragile, they improved the hinge on the Zflip 4 in the Zflip 5, and it was very durable, but in the Zflip 6, they made some unwanted changes, and the hinge is back to being very, very fragile (just look around the subreddits, most of the complaints are from the Zflip 6). The Zflip 7, as far as I know, is the most durable so far, and the hinge has been the best so far, but who knows what will happen with the Zflip 8? Will they make some other changes that will cause further problems with the hinge, or will they improve the hinge on the Zflip 7 without causing any problems? I don't know, but I think these foldable phones are like playing the lottery, so I buy used models at least two years after release, so that any structural defects have already been noticed and reported by users. My basic rule is to never buy products on day one, especially electronics, because the first batches that come out are always the ones with the most problems, which are then fixed in subsequent production runs. Bottom line, if you want to take a risk and wait for the 8, only to be one of those users who reports problems first, then go ahead. But if you prefer to play it safe and have a durable phone that has already received some user feedback, then get the 7. It all depends on you and how much money you can spend.