Stuff like this doesn't really show how trans is an issue, but how HUMANS are known to be issues.
Ultimately, like the bathrooms, changerooms should be lighted, and sealed from sight.
You know how doors in most houses (here at least) are designed so the frame blocks sight, but lets air in? Just fucking add those!
I've read the gaps under them, and such, are to allow for easier cleaning, but I prefer privacy over that...