Instead of Reaper FE, I do Reaper SE. Typically the second supply depot comes after second command center, but I make it supply depot before the 2nd command center.
I have won more games doing this. But I have yet to master micro and macro to get me into higher leagues.
- Enemy is more likely to lose mining time and have one or two worker scouts for proxies you are not even doing.
- Hides intention to expand or rush.
- Forces enemy to spend resources to get over wall or break wall.
- Concentrates any aggression to a small area (wall), which is vulnerable to splash damage (tank or mine).
Delays your own expansion slightly, for the result of causing opponent to doubt their build, delay their tech or expansion(s) being cautious of your lack of cards revealed.
On top of this I don’t give away my factory or starport behind the barracks. I make my opponent work hard to scout me. Overlord dives always die if they don’t have speed upgrade. Adepts can’t get in, and Reaper(s)of enemies which would have been more effective going to and fro your own natural and main, is made less effective because they are forced to only harass a concentrated area protected by your forces.
Sure your expansion is delayed a bit, but it significantly reduces your opponent’s access to information, and effectiveness of harassment.
Edit: High ground 2nd CC away from wall vision.