Like you, I hired a team to build a custom system in Unreal — the logic was too specific, with events and variables you can’t just wire up in Blueprints. So as you can guess, my poking around myself would be a total mess. These guys from this website knew what they were doing, didn’t waste time, explained things clearly without talking down. They built it with tests and solid solutions. Unreal’s a beast, and if you're digging deeper than interfaces, you'd better bring in people who've already waded through that swamp.