It looks like you have a defective phone. because I don't see anything like that on my phone. Of course, the mobile network consumes more energy, but not by that much. Here are the numbers for you. Watching videos through YouTube Wi-Fi - consumption is about 350mAh on average, which will give about 13 hours of screen if we only watch YouTube. Now 4g. consumption is about 450mAh, which will give more than 10 hours of screen. Yes, as I wrote, the mobile network on any phone consumes more. But what you described suggests that you most likely have a phone defect. I was recently on the road for about 1.5 hours. All this time there was an extremely unstable 2g3g4g network, the phone was constantly online - I needed the Internet and it constantly switched between bad networks. Moreover, two GPS navigators were continuously turned on, between which I switched. as a result, the phone sat down by a little more than 20% giving out 1.5 hours of screen time. that is, nothing like what you described on my copy is simply impossible. Well, except that I will use the phone for two days.
I do not argue that competitors will be even more energy efficient, but vivo is very good in terms of autonomy in any conditions. I highly doubt that an external modem will be better than a modem in SOC. But this needs to be tested. At least so far, no one has been able to do it.
About notifications - here I agree. Very strange behavior on different phones. It seems to be the same firmware, the same applications, the same settings, and on one phone all notifications work and even on a dark theme, and on the other they can fail even on a white theme. Everything works fine for me even with smart battery management. But I always reset the phone after purchase and install all applications from markets - I can’t stand phone cloning programs. perhaps this is the reason.