It's a little bit annoying that Android requires a valid signature to install the apk file in non-developer mode. I'm trying my best to not mess around with my daily usage phone (no developer mode normally), I have a dedicated phone for testing apps.
And you must bump the version to allow apps to be updated. So each time I make small changes, I have to bump up the version and then send the signed apk to my phone.
So... less than 48 hours, the version bumped from 3.0.0 to 3.0.8 already.