I am kinda glad she's not overusing hells (which I first noticed in 2014, with Bon Voyage Tour), she may look fierce as hell but dancing on heels put a lot of stress on your legs and mainly your back. So I think it's better she doesn't pull herself too much nowadays so she won't be regretting it later
Plus, for that hip-hop-ish dance style she's been doing recently sneakers and boots do look better to wear than high heels.