Unplugging works. For as long as it lasts. Studies on screen-free periods measure real but modest changes, like less time on the phone, while the boundary holds. None of these studies shows a “reset” in a single weekend.
A screen-free weekend doesn't decide what you do on Monday at 3:45 p.m.: that gets decided all over again, minute by minute, as soon as the weekend's boundary is over.
A booked coworking slot is a commitment you make once, not a rule to keep every single moment: at 3:45 there's a person who booked the same slot.
Reviews of the studies on the topic (such as the one by Radtke and colleagues, 2022) find results that differ from study to study: in some, something changes while the break lasts, in others nothing does. And there's no evidence of a change that lasts once the weekend is over.
No, it isn't a blocker: it's a timer with weighted hours and coworking appointments, and what you do with the rest of your time is up to you.
No, you can book a single 25 minute slot: it isn't designed as a multi-day challenge.