Optimal and ideal for everyone.
>Utc is horrible for anyone who travels or deals with people outside the timezone
What no. Those are the situations where variable timezones are the most annoying because that's when you have to do the most timezone converting. Frequent ambiguity as to which 9pm, having to do math to resolve it in to a time that makes sense relative to you, and that's if it's expressed in a way that lets you do so ie "UTC+2" but more often than not they say "Eastern European Time" like that clears it up for anyone who isn't their next door neighbour. You shouldn't have to turn to google to work out what time someone is trying to say.