If they “only” managed to kill this amount of people with that amount of (much more modern) explosives, isn’t that proof in itself that they don’t want to deal maximal casualties? Or otherwise they are very bad at it.

With that said, any amount of civilian death is tragic - and we should absolutely mandate Israel to be as specific in their attacks as possible. But 0 civilian casualty is impossible to achieve. What we can know, even according to the biased hamas numbers, they are roughly in the 2 civilian to 1 military personnel ratio, which is absolutely realistic given the circumstances/other modern warfares, etc. Feel free to refute this statement of mine, if you do believe that they “want to kill as many civilians as possible”.