At the time (ca. 2019) I only found three choices for 16-channel processors, at around $8k (forget what this was), ~$15k (Trinnov), and ~$20k (Datasat), all in USD. Things have changed since then, of course, and there are other options for 16 channels now that were not available even a few years ago. I may have missed other options back then as well, but those were the three I found and were suggested to me by various folk. The $8k choice was missing some features and was much more limited in processing flexibility, Datasat was having "issues" at the time plus cost more, and I was able to get a good deal on a refurbished 24-channel SDP-75 (JBL Synthesis Trinnov Altitude 32) so ran with it. So the value for me was in getting 16 channels plus all the other features.
If I had only needed 7-9 channels I would probably have something else, frankly, as I would not have stretched for the SDP-75 at 3x-5x the cost of top Denon or Marantz models. Since getting the SDP-75 I have been very happy with it, and its processing power and flexibility is pretty amazing. So for me, at the time, the SDP-75 presented the best overall value for the channel count and features I needed. I have not done any HW upgrades, but the SW upgrades have provided some additional codecs and features I would have had to buy another (newer) AVR/AVP to get, so in my mind after about 4 years I am >2/3 of the way to break-even compared to buying two AVPs in the same time period, not allowing for the additional features the SDP/Trinnov brings to the table.
"Value" is tricky to define; a $5k watch, $100k amplifier, and $200k car may be good values to folk much wealthier than I, and of course the SDP-75 is "outrageously priced" to many (perhaps most) people. At retail (and no I did not pay anywhere near retail for anything) the SDP-75 cost me less than 10% of the total (retail) system cost including processor, amps, speakers, and sources.
Objectively, the SDP-75/Trinnov does not have as good SINAD (and perhaps other specs) as some of the other top (green) processors in the chart, but it is in the ballpark. I use measurements as a starting point, mainly to rule out poorly-performing units, then focus on the features I want as well as the price. I did not look at the chart again but IIRC most of the top units were not available when I bought my SDP-75 and/or do not have 16 channels.
The debate goes on... - Don