That would not speed up production by one second and in fact would actually slow it down. Oh, you want a custom order, here, get in that long line over there that hasn't moved in 3 years and see how that works out.
If it isn't an option that you can easily do a full run of, it is custom and that requires a conversation with the CAD guy, wait while he makes the changes to the cut file, he sends them over for approval, you peruse said drawings, sign off if good, correct and return if not and repeat that until it looks like what you are after. That gets sent to the laser and you hope and pray that it doesn't become the version they use on the next order of normal parts and the nightmare that causes that no one wants to correct and now you have a batch of shit parts you have to pay for that no one else will ever buy.
Lawyers have nothing to do with this. There are two rows of hole in the slider and backer that have to line up. The ones in the slider are in a very narrow flange that will look like dog dookey if the average person tries to drill them. I would struggle to get them as nicely centered and spaced as they should be and I'm good at that sort of thing.
Lest we forget, that set of holes is spaced according to the length of the rail, how does one plan to make that look as good by not using that hole spacing?
Like I said, way too many things to go wrong to ever make that a good idea. That and when the shit hole spacing is done and it looks like crap, the owner sure as hell ain't going to tell all his buddies HE is the one that screwed up his Savvy product.