Get one of these:
https://www.andar.com/products/the-helm?variant=397924980491...
Pricey, but the lip covers the edge. My current one is 4 years old and lasted a couple of generations of Macbooks.
Yeah the sharp edges have bothered me since they started with the unibody. Luckily I'm completely off Mac these days. But really the last mac I enjoyed using was my powerbook. It had really nice plastic gaskets for the edges, a keyboard with really good travel and cupped keys, it was wonderful.
I got a plastic MacBook eventually which I filed down too because the edges were really sharp there. And plastic is easy to file. Also replaced the screen with a matte version, on the plastic MacBook that was also easy because the screens were readily available and there was no glass overlay.
Then I had a unibody MBP 15" matte. Less sharp and with off factory matte display. Not great keyboard though.
The current MBP I find abhorrent. Even after they switched from the horrible butterfly mistake the travel is still way too shallow. I just can't work with that anymore. These days I just don't buy laptops anymore. Only desk PCs.
This is my number one complaint about the M-series MBP line. Especially true of the cutout in the middle that has points so sharp they can cut you if you accidentally scrape it with your hand.