About food safety...
Before making a few comments, I'll note I'm not a wimp in this area: I have food in my cupboard marked "best before Dec 1992", have hanging meat in my cellar from last November, and go foraging for fruit, nuts and fungi. I regularly deliberately leave meat in the fridge beyond its use by date, I know how to hang pluck and draw pheasants, and occasionally kill my food just before eating it. I also know I am not an expert, and am continually learning new things in this area.
Basically we are talking probabilities here, and changing some of the variables a little can have a very significant effect on the probability of getting ill. Basically the reactions are exponential above an activation energy/temperature, so bugger all below and steep above that temperature.
There are some nasty buggers around, and typically they live in wet starch (e.g. cooked rice and pasta) rather than protein; the classic is bacillus cereus. With "wet starch", especially pasta, reheating can turn it into an unappetising mush, so there is a temptation to reheat the minimum amount. I think the potential danger is obvious. The other nasty with bacillus cereus is that it produces a toxin that isn't removed by heating.
That is all far less important with "pure" meat/veg items, so keeping bolognese sauce for a while and combining it with freshly cooked pasta is much safer than reheating the pasta.
And yes, stews that are a few days old really do taste
much better
If you are interested in this topic, then a suitable starting point is
Cooking For Geeks. Any food book that has a section "PEBKAC and RTFR" is worth a look