That's simply good writing practice. I find it more taxing to read digits than prose.
If I may ask: Do you also find numbers more difficult to parse when doing math pure math operations? Is this:
Two hundred thirty five plus one thousand eight hundred twenty two
Also easier for you to parse than this?
235 + 1822
Or do you have two "parsing modes" ("text" and "math"), and going from one to the other is the difficult part?