Oddly enough, that was a concern of mine as well! Overall, it's not too bad for me though. I'm just more concerned that it might make it slightly more prone to break in the future if I drop it the wrong way! I do have a case for it now, but you never know with these things. I suppose one advantage of Samsung or Apple is that they have quite a few repair options if something goes wrong with them and a decent turnaround, so yeah...
The nice thing too is that I can have the S9+ paid off a lot sooner than I would have if I took something else. So if something does come out later this year or the U12+ does a 180 in terms of public perception once its out there, I could consider something again in the near future. But so far, so good for the most part.