Agree with avoiding Avids but if your LBS won’t bleed them that tells me more about how shit their mechanic is than the brakes, to be honest.
I doubt it’s because they can’t bleed them – more likely that they are sick of charging £20 for a bleed, then having to bleed the same brakes for free a month later when the customer comes back in a rage claiming they weren’t done correctly.
Then again, a few weeks later, so this time the mechanic rebuilds them and £20 charge ends up costing days in free labour all because of avids sh*tty quality.