You’re always safer to plan on the basis that they’d need to be muzzled and on lead out anywhere that’s not secure and if they end up not having to be it’s a bonus.
I’ve never known one that wouldn’t be up for an hour’s stroll - weather dependant, yeah they’re sprinters but they’re still dogs, they like a mooch.
They do hate weather, as other people have said, jackets aren’t fashion accessories, they need them if you’re going to go out in cold or wet.
They’re not cuddly as in they’ll try and climb on your lap 😂 but they are affectionate, like to be near you or leaning on you.
Re walking 2…it’s not usually an issue, ex-racers have been taught to walk nicely on lead. It’s more space - do you have enough sofas for 2? Can you fit 2 in your car? Etc.
a couple of things to be aware of
They’re usually counter surfers and food thieves, a combination of being able to reach and the only time they’ve been near food it’s for them, so why would all food not be theirs? So you want to be able to keep them away from the kitchen and bins when you’re not in sight.
They usually have/get bad teeth, you can try cleaving them to stave it off a bit but it’s just a breed thing and dental treatment isn’t usually covered by insurance. I think you can get insurance that does, but you’d need to check really, it’s also not like a huge regular expense, but it’s likely to come up at some point.