For 7 years, I used Headway as a theme/page builder, and when I needed to use conditionals to hide/display content, I would be able to add them to the WP builder and use that inside an HT block.
Last December, I had to switch to Elementor as a page builder, and I can still use the conditionals in the same way, since the content is typically able to fit inside a wp editor while NOT using Elementor for those pages.
Now, considering that Gutenberg is also using blocks, how would conditionals be applied (assuming someone is NOT using the Classic editor). And then, that might also help figure out how to use conditionals with any other page builders, like Divi, Elementor, Beaver Builder, etc. as those are becoming more and more popular.