I think there are two main points here.
Firstly it is that to Nvidia standards, apparently there were actually only 12 really really good Freesync displays on the market. This could obviously also be attributed to Acer, Asus, Benq, and AOC having far better partnerships with Nvidia than the likes of Samsung or Dell, which I think should be expected. However, I don't think that is the case and it is more a combination of Nvidia having very high standards when it comes to adaptive refresh rate monitors (I mean, they use high end FPGA's to achieve theirs being so good) and a notion that the likes of Samsung just wanted to utilize adaptive refresh rate on their monitors as a marketing feature than an actually proper implementation.
The next thing to point out is the fact that many, including myself, can finally jump on a adaptive refresh rate monitor when it is time to get a new monitor and we will not have to buy my graphics cards according to our displays anymore! I'm so glad I waited this far, it will only get better from now on with universal support and with the fact that companies that wanted to utilize adaptive refresh just for marketing now have to do proper implementations for it to actually matter.