If they do floors without thresholds I don't think they know what they are doing.
That is not
in my opinion the professional woodworkers way to do any type of wood floor.
Let me be blunt-that's the half ass way to do it.
You are supposed to take a piece of wood the thickness of the tile or wood floor, which ever is greater and then bevel it to the lesser thickness.
This piece is usually about 4-6" wide.
Are you going to tell me they use 1/4 round moldings too!
If they do keep looking for a pro.
You take all the moldings off clean then up and air nail them back.
.Not sure how they get away with sub standard workmanship.
.