But I have a place with a yard in the suburbs too, and there the 10" Dob is great.
With astronomy, I’m a visual observer who has done most of my observations in my life with, besides binoculars, telescopes in the 72mm to 108mm range (2.8 to 4.25 inches aperture). I have a 10" Dob and like it a lot, but for me, rather than that being the minimum size, it is my maximum. And the 10" Dob definitely wouldn’t be suitable for my little city apartment where I solely keep a 72mm refractor. But I have a place with a yard in the suburbs too, and there the 10" Dob is great. Some nights though when conditions are marginal (lots of clouds around) and/or there isn’t much time to observe, or the Moon is pretty full, or my back is hurting, or I want to drive somewhere darker to view from but not get into breaking down the big Dob and wrestling it into and out of the car and then collimating it in the dark on the other end, my 4" refractor is best.