I agree, for a longer stay the options you mention are viable. However, for a weekend trip things get more complicated as there's simply not enough time for long transfers. That's the beauty of e.g. Elba, venice lido in my experience where there is a very short transfer to beach/sightseeing. My experience is also that these two airfields are very hassle free. It's just a shame that a number of these wonderful places will not be accessible realistically for extended weekend trips anymore... And I would have loved to go to Sardegna this year.
As you mention, Croatia is an excellent option in terms of accesibility, price levels, no hassle, friendliness, etc. Been to Losinj for a short stay and recommend it.
Agree to your last point on ways around things for locals. Guess I have to learn Italian as a first step...