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Not really. They don't have a very large dynamic range of airflow values. I think it's a 16X16 or perhaps 12X16.
Larger maps come in handy when you are making more power and want streetability and good manners. Plus, you can use the resolution to throw in things like spark timing to help idle control if you don't have an IAC valve, or cam timing control to help pass emissions NOx-wise (which is definitely not MS territory).
Accel DFI shouldn't take that long if you are starting from a known-good config. An experienced tuner starts with a map he has already done a lot of R&D on, and customizes it to the car in front of him. That way, things like injection phasing and throttle pump are almost-bang-on from the get-go.
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