I must say that could lead to changes in thinking and hopefully decreasing number of players who do not see any other way to counter SNS than SNS itself.
2 players using SnS if on at the same time may as well just melee fight as there is no advantage to, the larger army will win, and also SnS is not always guaranteed to get you free hits, many time the enemy units will return fire immediately. There are also places on the map that are buggy and your 30 second countdown to engaging jumps back to 2 mins over and over again forcing you to move closer. Eventually you are will in range and your advantage is lost again. So to suggest SnS is a mindless easy way to win I'd say you are wrong as you need to still understand some quirks the game throws at you and know how to deal with them.
Personally I rarely play 500s, I'm sick of the multi accounts in them, SnS is the least annoying thing to me.
Last paragraph leads me to one thought- why arts are so powerfull in hand to hand combat? they should have 2 factors- one is range factor, second is melee- which IMHO should be much lower like it is with planes on the ground.
In my experience if you catch artillery in a melee fight they will die quickly, I would not agree they are too strong, I also find cavalry to be pretty weak too so we are seeing totally different result which I assume is due to different playing styles. That is part of my point, if people use units differently you need to adapt your tactics to the situation. That is where people with skill will win over mindlessness.