The product is 222mm wide. It's just tiny. Why not just double the height and add a whole row of connectors? Call it the A-90x2.
The standard for full size HiFi gear was 420-440mm. Pioneer was 420mm, Sony, Sansui were 430mm Yamaha, Denon 435mm, Akai 440mm. They could all stack together. They all had space for plenty of inputs, outputs and future expansion. Expansion went vertically when they ran out of lateral space. Witness the AVRs that were a foot tall with hundreds of connectors.
In the interests of "minimalism", you've lost the ability for flexibility and facility. Audiophiles always end up plugging more stuff together, be in now or in the future. The better the gear, the more sources you want to use with it.
It will go full circle, just like it has done several times in the last 60+ years. The very first HiFi was monoblock amplifiers, preamplifiers, and source components. Then in the 60s along came "integrated" amplifiers. Then in the 70s, integrating the tuner and pursuing high power, low THD started a receiver power/performance race. Then in the 80s, integrateds devolved into high performance pre/power combos again. Then D/A's in the preamps in the 90s. Then surround. Phew. It goes on and on.
The cycle of a pile of disparate mini separates is almost over IMO. Witness the pictures of random heaps of non-matching "desktop" stuff you see in this and other forums. It's kids' stuff. No mature audiophile with money to spend and a nice house wants things that look more at home in mom's basement. SOTA integrated and SOTA D/A equipped amplifiers/streamers with multiple inputs are going to be the space saver and money savers once again.
Imagine if Topping designed a SOTA all in one product that had styling cues from B&O and all the flexibilty of true audiophile gear? Aspirational, stylish, a decent size that doesn't look like a toy and was premium priced.
Just my 2c.