@Cavalierchaos
Your reasons are the same as mine, and yes you can go for a walk without a dog, but I have so many happy memories of walking my previous pair, for me it's the fact that they enjoy it so much it makes me feel good too! A walk without a dog to me can rather drag, unless it's somewhere totally gorgeous and the best weather!
When I had my previous pair of whippet crosses 17 years ago, I also had children, so the pups' puppyhood was not the main focus, also they were later in the year (very easy for toilet training) and all the biting and madness happened between them, then they would just crash out. But I do recall we couldn't let them anywhere but the kitchen for a few years as they would go on the rampage with stuff that was important to the children!
Roll forward to now and Fern is currently my main focus and I'm really feeling the weight of responsibility so hugely.
Keep going, and send photos of the lovely times! But you know if you do decide it's too much, it's not a crime, he'll be fine in the end if you just make sure of where he's going. He looks gorgeous. 😍