There is somewhat of a ”religious” following of Storm and Trinnov. And there are derivatives of their products, or at least Storm in the AVR space. But except the price these are great products and offer instantaneous customer support.I’m not sure where this idea that Manufacturers have abandoned AVR’s comes from. There are several offerings for every budget. The tech and market has matured. It may seem dead compared to Stereo. The main differentiator between the two is the religious aspect which doesn’t seem to exist in the multi channel world. There has been a renaissance in high end audio but I’d estimate that 90% of new products in that genre offer nothing in terms of real improvement. It will pass.
Multichannel, especially the latest formats, is much harder to install and get right than stereo. Therefore i predict that the market will remain small.
New formats like Atmos are obviously much harder to install as more channels. Get it right not so much compared to simpler 5.1. Subs will be most difficult and rest usually just falls in place with the right room correction or some skill.