That is a pretty good argument for having a will, indeed.
For me personally, I am not attached to the concept of cash/assets enough to really care what happens with excess assets after I am gone. It is something entirely different if you have offspring, and want to pass accumulated assets to them, I get that. However, given how much money was printed recently, all the cash I leave behind might as well be burnt, I really dont care either way. If I have friends in need, I might as well pass some of it on to them before I go.
If you're married then pretty much everything goes to the spouse by default. Kids, likewise, are usually a default inheritor as well. Can get messy if you have a bunch of kids, but the default is usually an even split.
But what happens if you don't have a spouse or kids? Do you want that cash to go to a charity? To your shitty relative who you don't like? You gotta make it explicit.