Of course, it would depend on personal preferences and talents.
The physical keys on my keyboard are roughly the same size as the touch keyboard. Sizing them down so you can fit all the extra keys makes the keyboard between ¼ to ⅓ smaller. That's cutting off the function keys, which some of the more modern typewriters did have.
For my largish fingers and lowish coordination, the keys would be on the smallish side.
View attachment 60239
View attachment 60240
That is the perfect keyboard. Not much different in size.
Sent from my iPad 4 128GB