Hi Glen. What fields are you referring to?
Dates on WikiTree are not numeric. Granted, one possibility, a year by itself, is numeric. But the same field can as well contain a month in alphabetic form, e.g.
December 2020
or
24 Dec 2020
So the numeric keyboard wouldn't be appropriate.
See
https://www.wikitree.com/wiki/Help:Date_Fields#Input_Formats