I'm a huge fan of the Blocksy theme, and have been playing with it since november. The developers are listening and extremely supportive. I've been throwing issues and request at them, regarding html validation, page speed scores, privacy, accessibility, really nitty gritty stuff that isn't a priority to most theme users - and they took every single request seriously and implemented a fix or a feature where appropriate.

Some more highlights:
- usage of CSS Custom Properties (variables) makes it a absolute breeze to apply custom changes should there not be an option in the customizer.
- the same goes with the usage of CSS Grid. So easy to mod the layout.
- NO WebAIM accessibility errors. Not many themes can say that.
- Built in ajax search
- Actually useful widgets in the optional Blocksy Companion
- Great speeds out of the box, lean code.
- Pretty Gutenberg layouts out of the box, again, easy to customize.
- Valid HTML
- Easy to translate

I've made two production sites with Blocksy, https://neuc.dk/ and my personal blog using only Blocksy and core Gutenberg for content. A tiny bit of custom CSS for local font hosting and image branding, that's it. No page builders. No content related plugins, only supportive (cache, firewall, seo).

Should you feel like playing around with the Blocksy options, you're free to download and import a xml demo data set containing dummy Gutenberg posts, tags, categories and menus at https://labs.oldrup.net/blocksy/ It's a standard WordPress export, royalty free images provided by Pexels.

Bjarne Oldrup