I forgot I posted this and came back to posts. Glad to see others have experienced it too and understand the problem.
Overall yes, it's a minor annoyance, but it exists and has caused problems when scheduling events. Every so often in the FC or linkshell people will say "what is ST for you now? 7? right, then it's 8 my time"...it's just silly! The fact we can't rely on ST as a standard for all players is just annoying
... if everyone understood GMT then you could just schedule around that, but man it's even harder to get even other people in the same country as you to understand GMT doesn't change. ST would alleviate that - if it were reliable.