I have a reasonable knowledge of the wars since 1948
I have a better understanding of WW2 and recent events in Ukraine. The Russians took major losses fighting in BUA's even with massive artillery preparation, and I do not think that level is politically possible. And that is nothing of course comparable to the events of WW2.
Egypt's involvement is interesting, on one hand Hamas is an off shoot of the Muslim Brotherhood so I am sure they are rooting for Israel in that respect. On the other they have to show support to fellow Muslims from a regional perspective whilst at the same time minimising any direct involvement including allowing too many to pass over their border.
Destroying Hamas well there are apparently 25,000 active, they may have lost say 2,000 so far. But as has been repeatedly mentioned half the population is under 18 so even if they lost all of that force it would not take too long to rebuild. From a Hamas perspective the more casualties the better and they are well dug in.
Senior leadership is not there, I think the head honcho is based in Qatar.