In my opinion, the FSE rollout was not ready for prime time upon introduction, way to buggy, and WordPress.com Support wasn’t prepared to manage often unclear questions regarding the new format. This was certainly my experience. While I’ve tried many such themes, I’ve had to revert back to the Twenty Twenty One theme (which uses Block Editor Styles), in order to retain integrity of images – for both Single post & Portfolio project views. It is discouraging to find that, while FSE is the future of WordPress, no theme currently can accommodate the presentation of Single post displays of Featured Images that are of portrait (vertical) orientation. All such images are forced within predefined column widths, causing massive over scaling and reduced image clarity when viewing on devices other than phones. In fact, all FSE themes within the theme directory negate inclusion of such images in the Live Demo views. While I very much enjoy the capacity of FSE to customize my site as I would like it to be presented, at present it isn’t worth the switch. Herein, the idea of themes including block-based template parts within hybrid themes in an interesting proposition.