In my opinion, there'a lot of value for informal communication that all participants understand that e.g. 8am local time is morning everywhere. E.g. before you fly to another country, you can agree to meet with your hosts at 10am and know intuitively that it's quite sensible time.
But current model is too complicated, mainly due to daylight saving time (DST). If we would get rid of DST, and map timezones based on longitude and country borders (and state borders for larger countries like Russia, USA, Canada), things would be much simpler. Of course, when countries are split or merged, some updates would be needed, but usually then other data (city-country mappings etc.) needs to be updated too, so this wouldn't be that big issue.
But current model is too complicated, mainly due to daylight saving time (DST). If we would get rid of DST, and map timezones based on longitude and country borders (and state borders for larger countries like Russia, USA, Canada), things would be much simpler. Of course, when countries are split or merged, some updates would be needed, but usually then other data (city-country mappings etc.) needs to be updated too, so this wouldn't be that big issue.