> Whole teams moving icons around for months and bikeshedding over whether they wanted 8 or 10 spaces between labels and fields, and still no functioning app.

> Whole teams moving icons around for months and bikeshedding over whether they wanted 8 or 10 spaces between labels and fields, and still no functioning app. That sounds more like UI; I don't think this is what the author means by UX. Whether you have 8 or 10 spaces makes no impact on the architecture, but deciding that users should be able to change video quality does. If you try to decide on an architecture first, you will often constrain the UX of your product. If you don't realize that your product needs X feature, but your architecture doesn't support X, you're screwed.