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Well, let's cover this from a few angles, because it has several problems. From what I suspect is least to most important:
Rider Input:
Adding lean and throttle at the same time means you're also more likely to not be doing the turn quickly. The slower you are to turn, the longer it takes you to get on line. This means you're probably going wide to start, and will end up at a higher lean angle than the turn required had you gotten leaned over quickly.
Suspension:
Rolling on transfers weight from the front to the rear tire, while at the same time the front wheel is the wheel that 'does' the turning. You're demanding more from the front at the same time as you're taking traction away from it.
Tires/Traction:
More generally than above, you're going to risk out running your traction budget even further because you won't have a steady amount. This is two parts. First, as you lean over you have less and less contact patch to work with; if you're rolling on at the same time you won't have a settled bike with good traction to work with and you risk losing it. You also are trying to get the bike to 'steady out' (adding throttle to settle the line) and 'tighten up' (leaning more) at the same time so you're demanding contradictory uses of that traction.
Overall it's a good way to just run wide or worse have a low (or, rarely, high) side when you run out of tire traction.
Is that about right?
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