They want me to do squats and sprinting and stuff. Does it know if I actually do them or not?
These are the 'Hard' Missions fyi. And no, it doesn't. Each mission counter does seem to respond to a particular rhythm though so slower shaking for crunches for instance works better than shaking it quickly.
I don’t *actually* need to walk to get the good evolutions, right? I can just battle to get Vital Points instead?
Most cards do have one Mega locked behind the requirement to complete all Adventure Missions (this is what 'Adv' is

) of which there are 15 per card, but they aren't always what are considered the 'good' or best evolutions. Adventure Missions
are walking missions and they work similarly to previous Digivices. Sure, you could just shake your way to completion, but it's honestly easier and far less boring to simply walk. If you can't get concentrated time for this in, the Digivice V is relatively forgiving enough that you can just start on a stage, go about your day and let the battles happen as you move. If you're in a situation where you don't hear the alert or you have to have the sound off, you don't even need to worry because the battles will complete automatically without any input.
Otherwise, yes, the only requirements for the vast majority of evolutions are VP and battles/victories.
And also what of battle conditions? It says that you don’t actually need to win battles, just doing battles is enough. Is that true?
Rookie to Champion is the only transition where victories aren't a requirement. Everything else absolutely requires a good win percentage of at least 50-70% depending on what you're aiming for.
Do you guys like the vital bracelet compared to regular vpets?
There's much debate over whether or not the VB is a true vpet since, as you've pointed out, there are no care aspects involving the typical feeding and poop cleaning. Tbh, I don't really care about the comparison - What I do care about is how intrusive something is in my daily routine. In that regard, I absolutely adore the VB over the traditional vpet experience. I cannot say I miss having to listen for alerts for food, energy, etc. I was never bad at managing stats and care mistakes for getting the monsters I wanted, but it was definitely a process that would regularly divide my attention throughout the day. My real household pets aren't nearly as demanding lol. I always preferred Digivice gameplay. The pendulum walking function was much more appealing to me as someone who loves going outside and with battles occurring every so often as you walk, it better sold the fantasy that you are in the thick of it adventuring and training alongside your partner Digimon. Of course, the evolution mechanics always left a lot to be desired with the linear anime paths. The VB then is the perfect marriage between the two for me with the added bonus of actually being able to control when the battles are enabled, and with the Digivice V most recently, when the Digimon sleeps. Beyond that, the app tracks completion rates of your dim cards among other stats and seeing it all in one place like that always has me chasing the next evolution. It's also neat to take the monsters online for battles/raids and to see/compare the profiles of other tamers. Because of its flexibility, all of the gameplay on the device
and in the app occurs when I go for walks, something I was already doing daily anyways. In other words, the VB takes exactly zero time from my schedule and doesn't demand attention diverting my focus away from other critical daily tasks. Couldn't ask for a better experience.
it seems actual pets won’t be made anymore.
There might not be any new models in the pipeline (that we know of) and Bandai certainly is putting a lot of focus on the VB, but that doesn't mean interest is in regular vpets is totally dead. The X2 is getting its international launch in the coming months and I'm sure it won't be long before we hear about the X3 after that. Heck, the D-Ark is even getting an apparent update soon. You really never know what's coming.
If you press the bottom button on the Home Screen, it will say “Connect to App.” But I connected it to the app once before at and now it has a shield icon with a triangle and a “1” below it instead when I press it. [...] Is this my Tamer Level?
Yep, it's your Tamer Level and the icon will change as it goes up. Experience is gained solely within the app every time you gain a new evolution, complete a 'Special Mission', or battle in the arena or raids.
As for Primeval Warriors, I'd just wait it out. I see regular updates from Zenin all the time getting new stock on previously sold-out items, including pre-orders. You can get notifications for these if you subscribe to his mailing list. I think you need a VPN to access PB Japan these days.