You can; it’s just expensive. With Dante-compatible gear all the way through, for example, you could have ADC in your wireless mics and DAC not until your powered speakers. A high-end tour or auditorium built in the last few years might have that stuff. But analog gear still works fine, is more serviceable, is a lot cheaper, and is usually brought over to digital one system at a time (the biggest gains come from digital mixing boards).