As 1 datapoint to support this, see Audacity moving from WxWidgets to Qt for 4.0.
Absolutely, they need Qt in order to design and theme a UI that actually doesn't look terrible (They already had good experience in porting Musescore from vanilla C++ Qt5 to QML widgets, so I think they'll use a similar system for Audacity)
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Absolutely, they need Qt in order to design and theme a UI that actually doesn't look terrible (They already had good experience in porting Musescore from vanilla C++ Qt5 to QML widgets, so I think they'll use a similar system for Audacity)