I believe every sharing your experience on every trip, can help in more ways you can imagine.
First of all, small businesses can benifit from the exposure a review on local guides can give as the do not have the marketing budget big business has. So the quick review you give ‘Johnny’s hardware’ for certainly put them on the map. It can also help the individual that is new to a place, as I myself can attest many times I have been out and have had to rely on my fellow local guides to assist me getting around.
Therfore My favourite things to share on local guides are basic answers such as wheel chair accessibility, if they use credit/debit cards among others.
My point is, the most basic information can help the most on your travels, that is why it is My favorite thing to share on local guides.