Modern and contemporary are fairly broad terms.
Other terms to consider are:
naive, outsider, faux, folk, untrained, stylized, quirky, etc.
Jazzy.
If you compare lettering to music and dance, you can understand the difference between classically trained musicians, dancers, or scribes - and those who are self taught.
Or needlework.
The Gees Bend quilts are a very good example of folk art that is seen in galleries and museums of note.
Some viewers agree that those quilts are worthy - others are perplexed.
Also the word finesse can be helpful to the discussion.
There are untrained scribes with a lot of finesse - and some traditionally trained scribes with very little.
I like to be welcoming to anyone who feels like joining the activity and seldom make comments like this.
But, I do think the topic benefits from a few more adjectives.
Jean