For Pixels, at least, a great deal of effort went in to making them perfectly balanced.

Depends on your needs. If you actually use the mumpad a lot because you are an accountant or just do a lot of data entry, yeah, keep the mumpad. If you’re not actually using it much, then it’s really not that big a deal. You can also get a separate numpad and use that for the times you do need it, then move it out of the way the rest of the time.