Honestly, like selling any product, image does matter. Mention granite counter tops and many people do get a little excited. I do agree with you the big ticket items are important to have in working order, if not new (roof, A/C, heater). The guts and workings of a home are indeed important and vital in calculating the worth of the home (status of the home, quality of the workmanship, major items in working/good condition, etc). If not that person has never had to replace one of these items and see the bill.
There are definitely tag terms which appeal to people these days that hold high "emotional" value to people like "granite counter tops." People want to feel like they have an upscale, updated, customized home and often don't realize how great it is to have a NEW a/c unit and what it translates into an actual monetary amount within the home until an agent explains it to them.
Was it an agent or neighbor that made this comment? I am not sure if this applies, but unfortunately not everyone has the gift of delivering comments or critiques well, but if it was indeed an agent that knows the inventory well in your area, there may be some reason to their thought and might be something to consider. BUT if you have had support in the positive of your pricing, in the majority, listen to them. Don't let the negative feedback resonate and keep with you.
Good luck with your pricing and listing.