we had a bit of a discussion about this a while back, and as I remember a few people who know a lot more about these things than me suggested that blowing a bit sideways can change the tone (thinking more of situations like Charlotte Barbour-Condini's final in the BBC young musician competition, where she plays quite sideways without there being any physical need, and I'm sure she had a good reason). But in the case of the lady from ResoldoMilare, I'm sure you're right; she's playing a very long instrument for her arm-length, and has quite sensibly turned things to make the reach better. No one has attempted to make recorders with a curve like a Cornett, but if they had, I would have some sympathy!
Hm, B-flat being the equivalent of a treble's E-flat, I'll admit it caused me a certain amount of anxiety, especially the move from F (so on a descant, the C/B-flat change). There are a lot of fingers moving at once on that one, and I haven't always coordinated it as well as I'd like. We're all different; it's interesting how something can be a real bugbear for one person, and easy for another, and yet another issue can be the opposite way round.
edit on the Daphne singing/playing ladies; the recorder player is quite a versatile musician - not averse to bits of a little guitar thing, and singing when needed; this group may not be hanging around in the musical stratosphere with my heart-throbs like Nuria Rial, but they have kept me sane in many stressed moments, and will always occupy a very special place in my feelings. I also think it's good for recorder players to sing from time to time.