I think your confusion is in assuming that this is something you do rather than it being the status quo that receives no attention.
Up until recently I had about $80k sitting in a HYSA while interest rates on that account dropped like a rock. I only really noticed that after crunching the numbers and figuring out that was much beyond what I would realistically need. It took a few days to figure out what I could do about that given my income and employment situation.
I'm not sure how much of this applies to someone who is natively middle-class, but I find that part of the luxury of having a good income and a minimal lifestyle is just not thinking about money. If that's where your baseline is then you need some other motivation to scrutinize your finances. It comes more easily to me because I find it interesting but I can see someone without that drive just letting cash sit and being satisfied that the number looks big enough.