Not a gripe for this phone specifically ($349 is a great price point!) but more for the smartphone industry at large: I'm disappointed in the lack of progress since Huawei introduced the first real telephoto lens on the P30 Pro. Sure, there's the cheap knockoffs from OPPO, and Huawei added a nicer sensor to the P40 Pro, but no real innovation.
That's the big thing holding me (and many people) back from being able to completely let go of DSLRs. The P30 Pro is so close, it's a real revolution. But it's not quite good enough in many situations (autofocus is slow, any kind of action, low light is pretty bad.) Whatever company puts in a truly good quality, versatile telephoto lens... they'll have my money and a massive part of the DSLR market.
I have a feeling that it's going to be either Huawei incrementally improving their telephoto lens, Google delivering a computational breakthrough (and everyone else using it), or Apple/Samsung making some intricate, complex hardware.