1: No, you do not need to have a meso grinding character thats cause all your characters can be a meso grinder thanks to auction house sell whatever you find or dont want from cash shop ergo clothing.
2: Power comes at a price and NOW especially it comes from your wallet, and yes sure you can be pure f2p and get gains slow...and i mean slow even with a carry but those sweet sweet cubes are going to cost cash and bossers kinda got shafted this patch on cubes but you CAN make your own and some bosses drop th...hmmm well they did but now they are reduced to near sweetwater gear drop rates...can also grind elite mobs and bosses for cubes now...so to answer its p2w if you got it to spend if not f2p still can get you far just at a snails pace slower than reboot...
3: Thats a double edges sword, the reason should be a no brainer for any mapler but just in case low pop= economy is going to be sus, bots are going to be more frequent do to empty maps...empty maps , party play for bosses you cant handle will be just dead till you can either solo or get help.
High pop=Loads of people to talk to, bots are there but run like a crack head when spotted, guilds!, lots of maps taken for training, can get help for bosses if needed...lots and lots of trolls...
Honestly Kanna is a JMS class that almost all versions got EXCEPT KMS and all i can think of is KMS looking at its concept and looking at 1 specific skill and just said "Oh HELL no,not here! balance would be ruined horribly" and GMS be like "We take all the trash as long as we make cash!"
When kanna came out she was horrible no question and her worst aspect was her teleport(it was stupidly cluncky) her dps was sorta decent cause of how haku fan buff worked, other than that she was only good for one thing (kinshin) other than people liking the class lore or looks or utility gameplay was not it.
But there was one undeniable truth about kanna she was better than jett hands down...so in short should the skill be removed honestly yes and no, i say this cause while yes it brings a pacifier to too many people and no cause its to late to remove it the damage is done (mostly others naaaaing about how it will affect new players in fact they are actually just worried about them selves) cause as we see it anyone of these blasted forum posts with the mere mention of starting on reboot server say make a kanna to fund your self, and that's truly what is wrong with the class.
There should not be in any way shape or form for anyone to say " you NEED to make this class to advance on this server" that's BS! you can just as well make ANY class make a set of item/meso gear and with pets and grind out on reboot server, will it take longer HELL YES that's the whole dang point of reboot server to go back to the grind of the older years of the game but with increased difficulty and access to most item enhancements with mesos, hell you get 5x meso rate,higher rate of gear for your class dropping, free dmg%, meso red and black cubes, increased social interactions cause now you actually "NEED" (i say need but there will always be that try hard...) other people to progress and you still cry foul when when 20% meso/item gain is taken away...
Kannas kinshin skill is not needed people just been suckling on that skills teat for 8 years to long that you have grown depended on it and now that its slowly getting pulled out people about to cry a river and fight anyone that thinks other wise.
For aesthetics (and that sweet sweet +1 speed) 1h sword and shield, you can also just go two handed and equip the secondary weapon but you will notice the speed difference...BUT you asked for short and simple.
Buy a terminus defender star it to high heaven cube it for att% and be a tanky boi!!!