Originally Posted by Tubba
Yes, but there is the mashing process in all-grain which is water chemistry dependent. Boiling extract, not so much.
I suppose there is however, with extract brewing you also have the added issue of whatever was in the water the manufacturer used to make the extract. Whatever is in their water ends up in your boil kettle via the extract. I'm going to assume you weren't accounting for any of that (though maybe you were). If not, then I would take it just as easy with your first few all grain batches. I bet they'll be great, and if not, well, then see if messing with the water improves them after you've accounted for everything else.
I'm with Pcollins in doing what I can to keep things simple. Not to say that some folks can't take that attitude to an extreme and just become downright lazy
but I truly believe the less you mess, the better off you usually are. Exceptions exist, of course!
Either way, do what YOU feel would help your beer. That's the beauty of the hobby. FREEDOM!!!!!!!!!