The first opinion MAYBE right if he actually sees it or has an educated logics.
You MAYBE right if you actually see the blower never stop. It could stop while you were absent. And runs while you are home.
The second opinion has a point but not for freezing. 1.25" freon line (which is odd size for me) is too large for the 2 tons. And will cause issue of oil return back to compressor.
Anyway, get another company (largest one in town) and ask for the best.