"Proper" websites - as you call them - are incredibly difficult and expensive to maintain. When they were being built in the late 90s, early 00s the techniques to build them essentially meant anyone with a vaguely techie team could do website stuff.
Snap forward 20 years and the concept of what a website is is totally different. For a start people will arrive by google or social links meaning that your carefully curated navigational journeys are ruined. You need to be able to support not just people appearing at any page but also people using a variety of devices from low end android phones to 5k 27" iMacs. This means web has become a far more professional industry both in terms of coding but also content creation. No longer can you expect full concentration, you need to be able to deal with lazy flicking on phones. Plus don't underestimate the increasing use of voice.
The producisation of things such as BBC Programmes which allows for automatic deployment of a website for every single show ever broadcast means there are limits for what the "hobbyists" can do, but the advantages outweigh the loss for the most part. It also means that as sites, servers, and platforms become more complex you're able to patch the entire site with a code drop or by moving your buckets around AWS.
TL:DR, the web is bigger and needs to support more user agents. This means less room for bespoke and expensive sites.
I am sick of been persicuted by you immature TV Forumers!
scottishtv and Night Thoughts gave kudos