That’s mostly because of logistics, they have much less resources, Israel is supported majorly by the US, Israel has stuff like the Iron Dome. If Palestine/Hamas would set up any dedicated posts, they’d simply be bombed to oblivion, and that would be that. If they want to fight, being covert about it is their literal only choice.
Still shitty of course, but I’m pretty sure they don’t want to do it if there were any better alternatives to keep the fight up.