Tailwind is the latest bootstrap. These frameworks were designed to allow people with no skill in design/UI to produce something that passed for attractive. Since most clients are more concerned about time and cost than quality and originality, this approach effectively killed bespoke landing pages and led a lot of UI devs to move away from hand-coding styles to glomming on class names and using a "best practice" framework even though they were capable of writing the CSS from scratch. Now LLMs have trained on this boring cookie-cutter UI work so no one should be surprised that this is what comes out.