Glass, plastic, metal, leather, etc all the same to me as I have put a case on every phone I ever owned. Materials that allow wireless charging are more important to me.
Curved edges are the only thing I am seeing that annoys me about this phone. I really like tempered glass protectors and I have found none that I am happy with on my S7 (non-edge). I resorted to using a Spigen hard plastic one, and if the renders and leaks are correct, the V30 may have the same or similar screen shape.
I used to be a huge pusher for removable batteries; I travel a lot, and I always liked popping in a new battery. Now that I have used my S7 for about 15 months, I have come to appreciate the water resistance and I have been satisfied with managing my battery for travel purposes. The S7 with a non-removable battery has really been manageable for me, and I was worried about that when I got the phone. Fast charging and wireless charging has kept me happy.
I will be annoyed if wireless charging does not make it to Canada, as quickly popping my phone on my desk wireless and car charger means that I routinely get to the evening with about 60% battery without me thinking much about it and using the phone all day. Messing with cables would be an annoyance for me, especially if other markets got that feature (but may not be a deal-breaker, if the device has stellar battery life in reviews and early consumer reports).