I've been building websites for over 20 years and I've come back to frontend after a few years out of the industry recently, horrified to see what developers are doing with current trend tailwindcss trend, but understand why you'd want it. I pity whoever picks up those legacy projects

I thought about using custom tags before for components (not web components, which have a few gotchas) but it came down to SEO. If there were more certainty on the impact of custom tag on SEO I'd already be doing this.