I've been sly now for almost 8 months. I love shaving and wouldn't think about letting what's left up top growing back. For me, there haven't been many disadvantages to becoming sly. Here's where I insert the "But".
Either I have been, or am becoming more clumsy. Thus, leading to knocking my head against just about anything available.

If there's something sharp near my dome, rest assured I'm going to hit it and it's going to cut my head. I haven't had many (two or three) accidents with the blades from my HB, but I sure as hell have sliced up my head running into things. I just don't recall having this problem when I had a little hair up there. Anyone else run into this (no pun intended)?
When you had hair it was like a natural radar. Those things would hit your hair first and you would naturaly back off. Now your radar is gone so you have to be a little more aware of what's around your head. In time it will become second nature..... BUT I still whack mine pretty good now and then.
The Koz nailed this--it's something we all discover. Rental cars are my main issue--not being used to the doors, I hit and scrape the dome getting in and out all the time. I'm learning to be very careful

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yeah: I think we've all been there. Not so much lately, but now I've said that...
Yeah! Last week I had contact with my hacksaw in the shed in our backyard -ouch

J
Just finished examining a fresh red welt on the very top of my noggin. Tinkering with cars is definitely dangerous for the dome.
Worst I've had was a wopper from the top edge of the frame of an under the staircase storage closet--that sucker hurt and didn't completely heal for more than a week. Bummer.
Hmmm, maybe a beanie while doing "dangerous" chores?
Nope, it's the upper kitchen cabinet doors. Personally, I think they should all have rounded corners!
Have only hit the noggin once and it was a kitchen cabinet door - - -I am very careful - - -
I always find it funny how a bald head is considered to be a symbol for toughness when in fact - as WE all know - the bare chrome dome is so vulnerable.
I'm with Mike... it takes a while to develop your "sly warning system"!
Been there, done that.

I shave off my proximity alarm so it goes with the territory.
Tony