Well, I have good news and I have bad news for you, and they're the same thing:

An electric machine (other than the Decent) is not any more reproducible in terms of the outcome of the shot than a manual lever, and in many ways they're less reproducible. The reason is that the actual pressure the water is under is not the important thing, the important part of coffee extraction is how that water is flowing through the puck.

Due to just random happenstance configurations that the puck can settle into, applying the same pressure every time will not result in the same extraction every time. Someone skilled with a lever and who is used to knows what it feels like when a shot flows too fast or too slow can adjust the pressure on the fly to compensate, improving consistency.