I don't know about your specific example, but there's some stuff GDS hasn't touched (yet?) and it shows. The 'modern' stuff that has that consistent design across departments, awesome accessibility etc. is all great IME.

Devil's advocate though: I know someone who works in tax (for a private firm of accountants) and hates it. Too dumbed down, and the bar at which they need to reach out to HMRC for guidance or some other resource is just too low.

I find it often ends up linking through to actual legislature, so perhaps it's just something in the middle that's missing, the 'technical reference' level.