I understand the frustration with the lack of built-in responsive controls for blocks in FSE. Initially, I encountered this challenge as well.
During a recent proof-of-concept (POC) project, the client’s design team required a high degree of content editing flexibility with specific design preferences. While the core Gutenberg blocks provide a solid foundation for a design system (e.g., font size options for different alignments), responsive control features were missing. ( Requires pre-configured global styles. )
However, the beauty of the block system lies in its extensibility. There are excellent third-party block plugins like Spectra (from Ultimate Addons for Gutenberg) that offer granular responsive controls. These plugins allow you to customize font size, padding, margin, and other styles for each breakpoint (device size).
In essence, while FSE itself might not have built-in responsive controls yet, the block ecosystem offers powerful solutions. This POC experience might be helpful for others facing similar challenges.
Hope this info helps you out! Have a good day!
