If you get up early and stop replying to emails after 15:00-16:00 (when there isn't something scheduled going on) no one gets surprised.
The team there was shocked and maybe offended even, and I was informed it was verboten to work any of the next 3 days.
Differences in work cultures globally are staggering.
Everywhere I've lived and worked (only two countries, tbf), the idea of working on a holiday weekend is just ... not considered, outside of being on call and getting paid extra for it or similar.
In my experience it really depends on the individual, team, and company just how strict people are with not working unscheduled overtime on national holidays to crunch a release or not.
But assuming that it will happen, that's a first for me.
I've faced this first hand as I switch from one company to another. In my previous place, we enforced a hard limit on when we could be expected to respond, and nobody ever messaged me on slack/ sent me an e-mail after that. At my new place, people are constantly e-mailing and messaging into the small hours of the night. It's tiring to watch.
I'm not sure i can agree with that. Most of the communication in my office is a quick message in Slack, or a comment in Jira.
I feel like this is perhaps more of a matter between synchronous and asynchronous communication, GitLab has wrote a bit about this in their guide to remote work: https://about.gitlab.com/company/culture/all-remote/guide/
This is imho the worst part of WFH. Some people come to work at 6:00 and go home at 14:00, some come at 10:00 and leave at 18:00, and some even later. If you're in an office, the latecomer can just check the early birds office, "oh, you're here, can we ..." / "he's not here anymore, this will wait 'till tomorrow". With WFH it's constant emails and work calls, and for a lot of people it's hard to separate work/home, turn the work phone off (especially in small companies, where before the plague, if someone called you in the afternoon, it usually meant something horrible has happened).
The second thing i'd miss is all the non-work activities that happen at work, from random chatter, to lunch, practical jokes, etc. Also when dealing with clients, the after-meeting-beer usually solved a lot of problems with a lot of one-on-one chats, and informal talks about rwhat the issues are,... this is hard to do on zoom/teams/..., especially if there is a higher-up present, and the engineers are afraid to honestly say what's bothering them during day-to-day work.