Drupal currently supports IE11, and will do until Drupal 10 in about a year's time. Here's my proposal for how to support IE11 in a distribution without holding back from modern CSS.
We often end up with a lot of templates when theming, but we should also remember to create "sensible defaults", so before you start theming specifically your site doesn't look broken.
Here's an example of where "less is more" sometimes. I reckon we can make the video paragraph type in LocalGov Drupal simpler by just removing the template.
Currently LocalGov Drupal relies on Bootstrap for its grid system. I think we can achieve a really nice grid system with about 30 lines of CSS. Let's see!
Here are two short, related videos demoing how I create a view mode component, use that view mode in a views list in Patternlab, and then integrate both with Drupal.