There are many threads and articles on this. And why would the HT bypass option even exist, besides adding more watts to the front channels in a system?
You obviously use the internet for all sorts of things so must know there are all kinds of sites that say all kind of things. There are lots of people who believe in exotic expensive audio cables too. If you apply the same logic you will ask the same question about why would those things (exotic cables, $600,000 power amps, $15,000 AVRs) exist.
Just because those things exist does not mean they actually deliver what you want, if what you want is "sound quality". Again, if that's goal, then look to high quality recording media contents, speakers, room correction systems (including room acoustic treatment). That is not to say your RXV373 receiver is good enough for you MA Silver, but as mentioned, one of those recommended AVRs will most likely be if you don't need more than 50 WPC.
MA RX2 specs:
Sensitivity: 90 db/1W/1m
Nominal Impedance
6 Ohms
Maximum SPL
113.8
Power Handling (RMS)
100W
You can see that something like the AVR-X3700H, or Yamaha RX-A6A (even the RX-A4A) has more than enough output to destroy the little RX2.
A few years ago, I installed a Monitor Audio Silver 8 5.1 system for someone, in a large room and I bought the Marantz SR7009 to drive them. The Silver 8 system is more difficult to drive than your RX2, yet the SR7009 that is only a touch more powerful than the AVR-X3700H. It has no problem driving the Silver 8s. The guy is rich, and I could have bought him a 500 W separate amps but it wouldn't have make any audible difference for him.
By the way, no one will tell you not to spend money on separate preamps, dacs and power amps. I do that many times myself, though I started downsizing recently. Just gave another 250/500 W Halo amp away recently, but everyone who owned separate amps for various reasons that may or may not make sense for you.