[DocTomoe]

Back in the day, XML was almost universally hated by the people you describe as "greybeards", mostly because it was a convoluted "one size fits all" approach, hijacked by business, that ate bandwidth for overhead with none of it's promised benefits actually materializing (because everyone created their own, quasi-proprietary XML Scheme).

[wolco]

I remember a .NET developer using it in place of json. That was the slowest system I've ever seen.