I disagree. In the rare case that you want to uninstall this mod, you could always just temporarily install a waterfill mod to get rid of the extra grass-1.
What if I don't want to uninstall, what if it is forcefully uninstalled without my knowledge or agreement? How do I know which grass-1 tiles were landfill and which ones were always grass-1 when I'm waterfilling?
On the other hand, you could lose expensive structures like beacons, silos, assembling machines and storage chests if you are careless.
You die if you mine under yourself, and that's just a minor thing. And none of those structures are really worth much, you craft a new one every second. If you lose a silo then it's probably because you have so many of them that it's not a concern. You might lose the modules and might care about that, but only if you mine landfill tiles by hand since the deconstruction planner doesn't affect tiles if you also select entities.
And you only lose 1 of those cheap entities. Because after you lose one you just stop mining. It's not like you lose your whole factory running around mining the landfill, that would be so stupid that someone like that probably don't have the brain cells to breathe anyways...