Like I said, I think the old UPA-# series cut into Emotiva's sales of the XPA-# series! Likely, people bought them as a step up, but, then, realized there was no need to upgrade any further to the XPA!
The only complaint I have with my UPA-5 (which also applies to the XPA series is the ~20" depth does not really fit my cabinet well. As long as you can work around that, I would not get rid of it. I suspect you'll get at least another 10-15 years out of it, and it is very likely to drive your speakers quite nicely without needing replacement (but I forget what speakers you have)!
Here is Gene's review of your UPA-7:
https://www.audioholics.com/amplifier-reviews/emotiva-upa-7
The 140W X 2 is not much better than one of the more powerful AVR's , but the 238W X 2 at 4 ohms (70% increase into 4 ohms) reflects a better power supply than a normal AVR would have (which are typically closer to a 50% increase into 4 ohms),so if you split the load between the AVR and UPA-7, you are better than doubling the amount of power you have available!