Silver is most difficult especially on the plastic bar which is a different platform to sheet metal.
Normally if you just paint that you would see a difference especially in direct sunlight unless that whole side of the car is repainted to hide the section that got painted.
they won't quote you the whole side they know you won't like to pay for more than necessary so they paint just that spot hoping you aren't savvy to know or tell the difference. If you do, they will spin all sort of tech and marketing to sound like there's no problem and they are right.
for that I would surely just take it to a mobile visit you doer. Not worth the expense or hassle to go to a smash repairer for the above reasons unless you bat down and request to for the whole repreay