No, that's not true; a 2023 book giving advice like "don't use borders" is definitely not in any way a seminal source of "good design".
Besides, I'm not saying I think it's a fundamentally bad design, I'm saying those voices are drowned out by the people on-board with it - for a great example, consider how you just came into the conversation, squished the nuance I was discussing, and gave hyperbolic praise to their book just because you like their tool.
Millions of engineers are now more empowered to make design decisions - and given more convenient tools. The price - ignoring how CSS was designed to work, unreadable mess of classes in the markup, a bootstrap-like cookie cut approach to everything, and yes, the color purple.
Besides, I'm not saying I think it's a fundamentally bad design, I'm saying those voices are drowned out by the people on-board with it - for a great example, consider how you just came into the conversation, squished the nuance I was discussing, and gave hyperbolic praise to their book just because you like their tool.