If a country does any no-adjustment approach nationwide, people may want a single common day of the month to do daylight sensitive schedule adjustments, such as outdoor sports practices.

I propose overnight on the first Sunday of a month. For example, the week before, in spring (Northern hemisphere) soccer (or whatever activity) practice is at 16:00, the week after at 16:30 or 17:00 or whatever. In fall, the reverse, but the schedules all change on the same day. (Outliers will happen - this is a 90:10 suggestion, not 100:0.)

Think of all the families with 2 or 3 kids who have 2, 3, or 4 different activities each week, all at different times. Do we really want their schedules to potentially change in every week of the month? Yes, super-soccer mom or dad could cope, but why not try to keep it simpler?