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You are right when saying, "Since boost guage reads off of fuel pressure, fuel pressure is increased as well so theres increased fuel to compensate for the increased psi." But since when does having just a boost controller neccesitate tuning. It doesnt. But...
First off the stock ecu has a very conservative fuel and ignition curve. Turbo engines can be very picky and prone to detenation so the creators make the fuel curve so it can survive 200k miles with little problems. They also tune assuming none of the parts are going to change. So by leaning out the fuel curve, and advancing timing you can get decent power from just an ecu upgrade (mabye raising the boost a bit too).
Secondly do u realize how many things tuners change. From injectors, to MAFs, to turbos. This all GREATLY effects the way the ecu deals with power and fuel timing. Some things the computer can just plain not understand, such as bigger injectors. You dont need tuning for basic bolt ons (ie, intake, exhaust, dp, FMIC), but the next step is bigger injectors and bigger turbo. The stock ecu has no clue what to do in this case. So you have to tell it what to do, either with a reflash, a piggy back (bbooooo) or a standalone (FUCK YEA).
Tuning is EXTREMELY important. Dont ever think you can get by without it. If you want to make good power, and you want to do it somewhat reliable tuning is the most important upgrade you can do.
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