Refrigerator on a shared electric line with Stove and 5 countertop outlets

The refrigerator outlet being shared with countertop outlets is fine, and very common in older houses. However, there are some advantages to having the refrigerator be on a dedicated circuit. The primary advantage is that you're at no risk of some other device tripping the breaker, and you don't turn it back on right away for whatever reason, not realizing that your food is spoiling. The other advantage is that if you ever install a backup power source, such as a generator, it's much easier to wire that to keep your food save through power outages. It's up to you whether this is worth breaking out the drywall for or not.

The question is about resale value.

In some jurisdictions like Canada, or in the US where there is an applicable code amendments, the kitchen refrigerators must be on their own circuit. The same may apply to a garburator, or dishwasher circuit. Gas stoves can share a circuit.

A home inspector (for sales - not electrical inspection) likely won't find that issue: they don't check loads & circuits unless there is an obvious and visible reason to dig deeper.

Whether you disclose it is a different matter.

Cleaning the fridge spotless will do much for your resale value!

It sounds like you've got a good bead on the situation and that the circuit was already butchered with the stove. So absolutely, document your complaint, who responded and how along with a call and/or visit by whatever (could be City, Township or County) Code Inspector.

Your investment should be taken seriously, especially when "professionals" only take their shortcuts seriously...which is ALWAYS.

Definitely, raise a stink, make some waves and burn those bridges while you can for anything and everything out of whack. Your documentation then goes with the house that you never had a problem with and your price can be confidently top-dollar firm.