Stairs: it's not just going up and down them (with groceries, furniture, if you forgot something in another room). It's the space they take up. You're rationalizing.
Most are dark. It's a simple matter of the design, if you're not an end unit. If units are to be a solution to housing issues, someone has to live in the "bad" ones. If you're making new units, might as as well build ones without townhouses' weaknesses.
You can't tear down a single townhouse, they're structurally-reliant on their neighbors; you can't build on extra stories, that's also a structural issue and might break HOA rules. These hypothetical horizontal units can have yard space. Noise abatement is the same.
You're ignoring the main issue: getting people out of SFH, because they take up too much space. The point is to keep as many aspects of SFH as possible. SFH have access to light from at least 3 sides, so you have to have that. They tend to have only 2 flights of stairs for ~2000 sqft units; having 3 or more is often a dealbreaker. However, many SFH have detached garages; detached storage/private yard space is probably fine. So, I think this is a solution. If townhomes were the correct answer, they'd be more successful, and not just what people are settling for because they can't afford SFH.
Most are dark. It's a simple matter of the design, if you're not an end unit. If units are to be a solution to housing issues, someone has to live in the "bad" ones. If you're making new units, might as as well build ones without townhouses' weaknesses.
You can't tear down a single townhouse, they're structurally-reliant on their neighbors; you can't build on extra stories, that's also a structural issue and might break HOA rules. These hypothetical horizontal units can have yard space. Noise abatement is the same.
You're ignoring the main issue: getting people out of SFH, because they take up too much space. The point is to keep as many aspects of SFH as possible. SFH have access to light from at least 3 sides, so you have to have that. They tend to have only 2 flights of stairs for ~2000 sqft units; having 3 or more is often a dealbreaker. However, many SFH have detached garages; detached storage/private yard space is probably fine. So, I think this is a solution. If townhomes were the correct answer, they'd be more successful, and not just what people are settling for because they can't afford SFH.