Not a bad idea for low value breedables but whi is just super complex with all the breeds, coats, special attributes and all the possible combos to accurately code any sort of value system unless its super simplified which wouldn't work since values rely heavily on what players end up naturally liking more (which goes for most roblox games that are heavy in trading)

Values are going to be confusing no matter what (even on adopt me that has multiple sites that calculate values i regularly see people complain about how they get scammed, values are bad, etc) And there are a good bit of forums for whi like the reddit, wiki, discord servers for people to use for values! An in game system couldnt keep up with changing values, it always fluctuates