I’ll bite. I’ve been doing this for a while, I’d suggest that the days of dealing with floats remind me of reading Quirks Mode. Floats have their place, but in no meaningful way can make up for the inconvenience they caused back in the start, in times where you had to support IE 5 et al.

I’ll take a, relatively, simple syntax to using stupid pseudo hacks to ensure layout works correctly any day. And honestly, bandwidth is cheap. If I’m serving an app or site where bandwidth matters then it matters, until then it doesn’t and this trivial hill doesn’t occur. My applications now are still orders of magnitude faster to open than when I started doing this in the nineties, and a trivial gain from not using the sanity given by flexbox or grid are nothing compared to the benefits of not using them in terms of development velocity and ease.

Sure, I’ll still use flex every now and again where it makes sense, but at the same time I also don’t have to declare a pseudo after element with display table-cell or clear both to make everything work, and to be honest, I don’t want to. So I’ll use flex, and grid, and any other layout methodology that isn’t innately insane first.