Some people want level sync to make it easier to play with friends which is a good reason.
Others want level sync to rank up faster which is ridiculous.

If level sync will be implemented at some point, please make it so that grinding with level sync wouldn't be the quickest way to rank up by adding some sorts of penalties and limits.

Remember level sync parties in FFXI? Same parties that stayed synced in Dunes and Qufim all the way to the cap and had almost no idea how to play their job well? I sure don't want to see those players in the same party as I.

I would see this coming maybe 4-6+ years later when there is tons of end game content but now? Absolutely not.