Gaza has fairly low civilian:combatant death ratios, lower than in most comparable urban wars. It's not hard to calculate them, the information is partly public (published by Hamas and IDF). However, many people chose to believe whatever they want to believe instead of going for the facts, I've seen some people come up with numbers ad hoc that are ten times than what Hamas reports, or they claim IDF has basically not killed any Hamas combatants at all.
But if you look at it in terms of civilian casualties, they've gone down massively since the start of the war. Israel "has" backed off in many senses of the word.
The problem is that Israel hasn't left Gaza, because despite your statement that the entire Hamas command staff is dead, it seems very likely that the minute Israel leaves, Hamas regains control of Gaza and starts building up strike capability again. So we're in a semi-holding pattern.
Now, there are good questions about why we're in this holding pattern. Many people (including me) think that it's because Netanyahu isn't trying to actually "win" the war, but prolong it, so this situation is good for him. Hence no steps to leave and set up a Hamas alternative, but also no move to more decisively finish the war either. A holding pattern suits Netanyahu just fine, at the expense first and foremost of the Gazan population, but also of the Israeli population (and also the Israeli economy, reputation, etc).
To clarify, I'm not trying to make any persuasive arguments about this. This is based on my own calculations, and there is generally not enough publicly available information to come to a fully informed verdict. For example, if you take all figures by Hamas, including some of the low number of deaths of their own fighters they reported, the ratio climbs up to 4:1 or more. I doubt anyone can say with certainty what the right figures are (well, perhaps some can provide good estimates, but not publicly).
I'd be interested in knowing how the IDF mandate to destroy Hamas is defined concretely in terms of KIA of enemy combatants but perhaps that hasn't even been decided yet.
You could listen to testimony from those within the IDF:
"the IDF judged it permissible to kill more than 100 civilians in attacks on a top-ranking Hamas officials" ... "We’ve killed people with collateral damage in the high double digits, if not low triple digits" ... "they were authorised to kill up to “20 uninvolved civilians” for a single operative, regardless of their rank, military importance, or age" ... "It’s much easier to bomb a family’s home"
https://www.theguardian.com/world/2024/apr/03/israel-gaza-ai...
When looking at this we have assess both the theoretical rules of combat and the actual implementation of those and compare them to an ally nation in other active combat zones like the US, UK, NATO forces in various places. No army is good at being ethical, foir want of a better word, but the Israelli government and the IDF seem to fail much more at holding to what most people would consider acceptable standards of behaviour.
I always try to base my judgments on the actual numbers rather than qualitative anecdotal evidence since the latter is relatively worthless (for statistical reasons alone). The problem is also that you can always find some people who support some narrative. Often these people don't know the numbers themselves.
A problem with numbers is that they are very prone to manipulation. Who gets to decide who is a combatant and who is a civilian? The IDF's computer algorithms like Lavender system categorise large numbers of people as enemy combatants without any evidence or visible reasoning. Who's numbers do you use? Do you include indirect deaths as a result of of IDF action? And on and on. Lies damn lies and statistics.
Regardless of number I think people can be judged on their intent, actions & policies they put in place and enforce. That's what we judge people on in courts of law.
This might be true but would be an easier argument to make persuasively if Israel had backed off after it more or less roflstomped the Al Qassam order of battle and virtually the entire Hamas command staff.