In my case, I use simple, quick code a lot for landing pages for clients and advertising in general, as well as for websites that are mostly static but occasion

In my case, I use simple, quick code a lot for landing pages for clients and advertising in general, as well as for websites that are mostly static but occasionally need dynamic elements - most of my web series web pages end up either like this or built in Wordpress. Anything that's either focused on content or sales and either doesn't have a programmatic backend or hands off to another site will probably fall into the "not a full-fledged webapp" category. If I'm running an A/B test on a landing page, for example, I just need logging code and a conditional to choose what variants to display on-page. There's a lot of conditionals based on input conditions, too - "Hello, Hacker News reader!", redirects depending on country of origin, that sort of thing. I'll also use simple snippets of PHP or Javascript on sites that are already using Wordpress, but there you're locked into PHP from the outset, of course.