Yes, I would say that the side-quests do matter, if you are trying to complete a game 100%. Games like Super Mario RPG: Legend of the Seven Stars on the SNES, really need to be completed 100% if you want to get the feel that you have properly played through and made the most of the game. The Final Fantasy games are another exception, you should try and get to every single Treasure Chest!
In a nutshell, doing the side-quests makes a big difference towards your completion of the game. Of course, you don't have to all the side-quests if you don't want to. Your choice. All the best, --Totilix.
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