It was you who brought up 1 v 1. Period. I checked you for applying 1 v 1 player matters to a team game, and also checked your assumption that a mage versus a melee is an automatic loss for a mage, which you are still blatantly incorrect as you should never assume the encounter results in a deathmatch. A mage that engages a melee at a disadvantage is foolish. A Melee caught by a mage off guard alone is a similar fool.
MOBA was just an example of the inspiration. This is still a team game with controlled participation. You may have had an argument if this was open world PvP but it is not. However many of the universal PvP issues still apply and SE intelligently checked them by giving Mages a clear vulnerability for their otherwise massive impact. They also checked it by giving Bards a damage Sweetspot within the gap-close distance of melees.
Many of your complaints come from the gripe that you get focused as a mage - my recommendation to you is not to play one in PvP if it bothers you as much or, alternatively, get pocket tank. The difference between queuing alone and queuing with even one friend is night and day in my experience - and this is speaking as a Scholar healer as well. Having someone to protect who also protects you gives you a strong level of stability in the chaos of what's going on.
Otherwise, you have more tools to address an opponent than any other class type and the highest potential impact on any match. (Especially healers in frontline because they come at a premium.) It would take an entire restructuring of PvP party mechanics from the ground up to balance Mages for lack of interrupts. I honestly don't see Mages as a whole actually desiring what the trade off would be to remove the interrupt mechanic.
I see the balancing reasons for the interrupts and what it adds to the party dynamics. I'm not telling you not to be frustrated by the mechanic, but it is the mechanic that holds the classes together. What you are asking for, is an entirely new and different PvP system - that's unlikely to happen as what we have now is popular - more so in Japan than EU/NA but that's enough to keep from a complete reformation.
On a sidenote, Adders made a pretty strong showing last night when I got on.