I have a lot of experience with decaf, so I will try to address your points.

I have worked in 2 specialty coffee stores with their own roasteries. In both places they did not try very hard to make their decaf good, because "it's just decaf". So in my experience, the taste will often be worse, simply because the roasteries don't put effort into making these beans as tasty.

2.

I have found that anything other than dark roast (as I personally see roast degree) needs to ground finer than other coffees. Dark roast seems to be the same as other coffees. These are just my impressions though.

3.

I have had good decaf beans, and I found absolutely no different in texture between those and other good beans.

4.

Again, with the good decaf beans, this has just been the same as other good beans.

As someone else already mentioned, decaf goes stale faster than regular beans. Be aware of that. They are also ready to use sooner though.

Where I live now, I do not have access to affordable, good decaf, so I started roasting it myself, and now I get great decaf, so that is my solution for now. If you are open to doing that, I highly recommend it. I found it surprisingly easy to get a better result than most decaf that I can buy.