What is it about free lipids and proteins spontaneously joining together in chaotic aquatic environments to form highly resilient microscopically sub-dividable shells that you find so trollishly unrelated to the concept of membranes forming in early earth conditions?
This would have been at a period before any real sophisticated attackers exist, and before life had built up any specific requirements of an "internal" environment too.
It seems intuitive that this would be how it started, goopy little bubbles filled with goo, just barely keeping out the other goo that would disrupt it.
When you find a living organism relying on sea foam to construct an organelle, you may file for your Nobel Prize.
Literally all the organisms we know about make all the membranes they use by adding to an existing membrane, not fetching them from out of their environment. And really, why should they?
Finally: a soap bubble film has air on both sides, and water solution between, and is thus the opposite of any membrane in a cell, which has water on both sides and glyceride in between.
