Sometime it would be nice to pass more than just OHLCV (I see Bid/Ask added). For raw processing this might include strange stuff like (Typical*Typical) value (bad example). Maybe the phase of the moon when that tick was processed... Etc...
The goal was to allow flexibility to the developer of a BarType to bundle other information along with the bar back to the indicators/strategies.
In NT7, OHLC were all considered price data, hopefully that assumption doesn't hold true in NT8 orther are ways to override charting. For example the NIKKI has a 5 tick size, if you are passing back OHLC as single ints, you cannot see anything other than the 5 tick intervals. I had to override the instrument to a 1 tick size which has other implications.
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