I’ll have to do some more research on the receiver…. At first blush it sounds like a really weak link in the system. But if you are OK with it and are not looking to upgrade.
Decreases in sound quality happen at glacial rates. So, it is unlikely you would notice unless you dropped in a new component.
But… the MAc. Heavy is good! While it may be a bit inconvenient… this has always been a really good sign for me in the lady 50 years of pursuing the high end. I have found the relationship between sound and weight virtually perfect. I don’t think I own a component less then 35 lbs. Don’t move it a lot. Get help. It is worth it.
Definitely 20 years or more are appropriate on an audiophile component… and a refresh from the manufacturer will replace capacitors and fading components.
Sonus Faber speakers are very natural an musical… not surprising you guys like the sound. Order a new remote.