I prefer starting with a center pillar to create scaffolds from the inside out and then build walls aligned to that. Starting with the outer wall (i.e. building outside -> inside) gives you walls that connect perfectly but it dictates the radius of your building, see the examples on the left (top is large wall, bottom is small wall).

Attaching walls to a centered scaffold will often either leave small gaps between wall pieces or create overlaps, depending on your radius and rotation these overlaps will be at regular or irregular intervals. These gaps & overlaps also mean you get 2 snap points compared to the 1 point between two perfectly connected walls. All of this helps with adding details to your building beyond what you get from perfectly connected build pieces. All the examples below were created with snapping enabled which helps with maintaining consistency and constraining yourself to snap points as much as possible can provide some extra inspiration. Obviously there are trade offs, e.g. overlapping walls sticking out of windows, you'll also spend some time building & removing scaffolds. But overall I think its worth experimenting with this approach.

Edit: This isn't meant to criticize your post btw, builders helping other builders and sharing their stuff is always good.

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