The biggest downside to the Nokia 7 plus is the audio quality. I'm using the stable pie version and there are some improvements overall as the stutters and lags in the UI are gone now.
But the audio output from earphones and the speaker is still poor.
Nokia definitely need to give an audio rendering software like Dolby like in the previous Nokia devices. This could be easily given as an ota update. Nokia should stick to their promise of continuously improving the device as it's one of the premium offering from the company.