I check the locations when I’m at home all the time, anyway. I have a decent mix of stuff taken with my big camera of birds, from when I’m inside the house where I have to manually mark the location, as well as stuff taken with my phone, either from inside the house or out, where the location is off enough to put it outside the proposed small geofence.
No, I’d be checking the obscuration for EVERY observation even still. Maybe the small area would catch most of them, but I’d still have to check all of them. My property is an odd shape, too, so unless irregular shapes could be drawn/uploaded manually, chances are accurate locations within my yard would still fall outside the proposed small area geofence.
And then of course still every observation when I’m out on my neighborhood walks would have to be manually obscured. And if I allowed myself to get lazy and NOT check the observations at my house, then I’d get into a bad habit and wind up with a lot of observations that SHOULD be obscured but aren’t. And it would happen, no doubt. I know how my mind works. I still say if I can’t make the geofence the size and dimensions I want, then it’s a “feature” that’s not worthwhile for me to even use.