As for the idea that it used to be about deaths and now its all about overreacting to cases, this only covers a few narrow perspectives, the priorities of societies and specific forces within them, etc.
When it comes to actually managing infectious diseases and the epidemiology, its always been about cases and it always will be. Just because we were shit about trying to find all cases in the first months, and that due to rubbish testing capacity people like me had to use the death figures as a proxy for estimating total number of infections, doesnt mean that case numbers were not a highly relevant part of what proper epidemiology would have looked like at the time. They were key to understanding the situation, and large gaps in this area are one of the big reasons our timing was all wrong. Its easy to find government scientific advisor quotes from the first 13 days of March where they expected the peak was months away in the summer, because their understanding of the situation at the time was wrong, because they didnt have a real handle on case numbers at all. Now they also mentioned summer because their original strategy involved a lot less suppression and they thought they'd get the peak to build slowly, but they still fundamentally failed to recognise the stage our epidemic was at back then. Its not just number of cases either, its what you can then do with that data, such as estimate how long its taking the number of infections to double, which is another key bit of data for getting your suppression timing right.