It's not really a secret that the Battle Tower was eviscerated in Sword and Shield for some bizarre attempt at parity with Battle Spot, but all that doom and gloom tends to overshadow GameFreak's serious attempt to make good Battle Facilities again in both DLC expansions, that was in my eyes largely successful. Unfortunately, both lack a hugely important feature: Suspend!
Restricted Sparring is in the Isle of Armor, and forces you to use a monotype team with only 2 party heals for your streak. The second restriction is hugely limiting, and possibly why GameFreak didn't think it was necessary to add a suspend feature. But regardless of what they thought, good RS streaks can often take multiple days even with heavy play, to say nothing of how much extra time top level and/or lighter play sessions can add to the time elapsed during a streak. You can, of course, use the Switch's sleep function to take breaks, but this has multiple issues. First, you can't play anything else on your Switch during a streak. Personally, I like to play multiple games on my Switch, but this isn't possible during a streak. It essentially forces someone to fully commit to RS for a while, even though there are many times I'd like to just play for an hour or so, then play something else more relaxing. The second issue is hard/software failures. While these are unavoidable to some extent, never having the option to close down the software only exacerbates the issue. I love RS, but this can unfortunately be a sizable damper on it.
But that's nothing compared to the other facility introducted in the Crown Tundra, Dynamax Adventures. For a lot of people, this was a fun way to get all the legendaries, but it also has an endless mode that is functionally a new twist on the Battle Factory. You can play this mode single player, though having 3 dumbass AI partners tends to put a stop towards both motivation and the length of your streak. For this, the lack of suspend isn't a huge deal, really. But if you want to play with friends? Hoo boy. First, multiplayer in Pokemon forces animations on, which adds a lot of time. From some runs others have done, a solid 4 player run can take several hours. Getting 4 people together for several hours can be a bit of a logistical hassle by itself, but DA does everything in its power to make the experience worse. First, you only recruit people at the start of your streak. So if one person has to leave earlier than the rest, well, congrats, you have an AI partner for the rest of the run and there's nothing you can do about it. And then, every option in DA is timed. Picking the route or the defeated Pokemon is 20 seconds, and picking a move is 30 seconds (online only, at least). These are pretty short timers! Thankfully, timing out just picks a default option (route choice goes to where your cursor is, the defeated mon choice is no and it picks the first move in your set) instead of disconnecting, but still, when I say you need to have 4 people together for several hours, they need to be THERE. God forbid even a 5 minute distraction comes up for someone. And since it's online, there's no way to utilize sleep mode. It all comes together for a package that's almost as hostile to the player as possible. Honestly, I've barely played Endless DA, and that's a huge shame since I think this facility is really, really cool.
It's a shame that two really good aspects of the DLC have to deal with this baffling lack of suspend. It gets even more aggravating when you realize it's been a mainstay of previous Battle Facilities, and from a handheld gaming series no less, when handhelds are the epitome of "people have other things to do". I recognize that both modes have some slight complications wrt implementing a suspend feature due to their lack of healing, but I simply can't see it as a big enough barrier to justify not implementing a feature whose omission is very much to the detriment of both facilities.