[slezyr]

Because there is regularly no need for these. You can add num block to any part of the keyboard and switch to it with one key press(Hold or Tap) You can also get separate and programmable num block in addition if you really want it.

[CarVac]

On my ergo I use the home row for the numbers. It's way faster because you can use 8 fingers for 10 numbers instead of 3 fingers for 10.

[yoodenvranx]

Of course there is no need for them but I am just used to use one and I would miss it.