The biggest struggle with any kind of WP builder (and I tried them about all) for me is to have consistent font sizing and spacing settings for headings, containers, blocks. What would make a huge difference would be presets. A bit like the default values - but more options and also for container paddings and margins.
From a UX like what Astra offers for colors and font-types.
Oh, and the settings should auto apply to Bricks Blocks and the equivalent WP core blocks. So Bricks pages are consistent with core Posts.