This is a great change. For a long time I've been hoping WP would evolve in this area.

Every conference I attend during the year takes place on weekdays, with exception of WordCamps. Weekday events are way more convenient, and they don't take away the weekend.

I'm sure 2020 will be a test year for this, and I think folks who are unsure about the change will find they prefer it to having their weekend eaten up, only to return to work blurry eyed on Monday.