It’s changed, but is a wash:

On the positive side, my electronic toothbrush allows me to avoid excessive pressure via real-time green/red light.

On the negative side, it guilt trips me with a sad face emoji any time my brushing time is under 2 minutes.

Toothbrush UX is the same today as it was when we were hunter gatherers: use an abrasive tool to ablate plaque from the teeth and gums without removing enamel

https://www.youtube.com/watch?v=zMuTG6fOMCg

The variety of form factors offered are the only difference