I've been trying to make a general-purpose 2PC approach work in my app, and it hasn't been going super well (due to everything except spicedb itself, which is awesome), so I'm looking into other approaches. I am curious about the "**Not storing relationships in the relational database**" approach, as it's something I didn't fully consider until now, but it's nice that it eliminates a dual-write in many cases. How common is this approach? Have many people tried it and liked it? Or maybe found downsides that aren't immediately apparent?