Taking this more seriously than it perhaps deserves: if that’s true, why isn’t widespread adoption of this approach growing?

Whether or not it’s a good idea, “realistic” implies practicality, which could presumably be measured by whether people find it worthwhile to do the thing.

I suppose it depends on what you're protecting, who's out there to get you, and how boring and time consuming it is to clean up after a breach (can't that take weeks or months), etc.

Aren't you're a bit asking "When X transportation method isn't used by everyone, can it really be any good?" :-)