I've found "At your own discretion" jobs are great. The downside is they can be hard for a company to justify unless the space is being used for other means than just "the occasional office space". I'm "100% remote" but can head in to our main office (just under 2 hours away) any time and if it's a multi-day engagement there is a hotel across the street. Far enough away that I never feel like I have to come in for anything but close enough that if something is better done in person/a fun event I can go there without coordinating flights and a rental or driving all day.

My last job had a similar structure but the office was ~15 minutes away so it was harder to push back on some "well let's just all work on this here together for the next 3 weeks since we're local" type asks and didn't work out as well. I don't mind collaborating but after years of not being used to coming in every day coming in is honestly not much better to me than the idea of "my job requires me to fly out for weeks at a time" type travel (which I've also done before).