True idle? Like 0% CPU usage, in Task Manager? Or just idle in that you're not running any foreground apps? My corporate laptop almost never truly idles. There's usually something chewing up some background cycles, it seems. Anyway, I wouldn't be too concerned about an idle temperature of 54 C. These CPUs are made to withstand a lot of heat. You could tweak your fan curves, but cooling it more than necessary will just waste battery power.
The bigger issue I have is that even when I set Windows to maximum power saving mode, I don't even get like 3 hours of charge out of a fairly new Dell Precision laptop, simply running a web browser or MS Teams. If Intel doesn't really improve on efficiency, they're probably going to lose more of the laptop segment. Right now, I would not buy an Intel laptop, if I really needed good battery life. I'm not one to go for a Mac, but I think a lot of people would.
In my opinion, the best option is to tweak the PL (Power Limit) settings, using a tool like ThrottleStop. However, I would only do this to combat fan noise or extend battery life. During the summer, I used it to reduce the amount of heat the laptop would pump into the room. CPU temperatures aren't necessarily a problem, by themselves.
I feel this. Mine definitely seems heavier than it should be.