I have also used only UTC for any time display in any of my devices, clocks, computers, mobile phones, but for much more time, for at least 20 years. I find it

I have also used only UTC for any time display in any of my devices, clocks, computers, mobile phones, but for much more time, for at least 20 years. I find it easier to keep in mind the current time zone offset and add it mentally to the displayed value when that is necessary (i.e. for comparison with time values coming from external sources, e.g. event schedules), regardless if it is summer or winter or I am in a business trip in another time zone, than to change the displayed value to reflect the correct local time when needed, and then to account for that.