First off, I maybe the only few that really enjoy a grindy game. I do consider myself a no life gamer outaide of my normal 9-5 job, other than that I do spend most of my time gaming and that’s where most of my social interaction comes from.
Not saying there are no down sides to ToS and this is sorely based on my personal opinion so please take it with a grain of salt.
why I like grindy games:
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Games that cater to the western community tend to get really boring fast, mainly because no life gamers can usually get to max level within days of the games’ release. After that you are pretty much left with little to no content because the developers could not keep up with content updates.
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It is actually more casual player friendly if you think about it, compare to the big name MMOs out there that require you to have premades or a solid raid groups (10+ players) for end game contents. The only way you will feel pressured by the grind is if you are pushing yourself way too hard to get to the “top”.
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Quests are linear and gets boring real fast. Unless you are the type of person that is really into the lore and side stories, many people these days skip dialogs and rely completely on the “tl;dr” section of the quests (aka quest summary) to finish them. Sure you will encounter some really exciting questline throughout your gameplay but 99% of the time it will be the same old “kill this, or collect these” type of quests.
ToS can definitely improve the grinding aspect of the game though…
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of course fixing the monster and exp scaling.
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Adding more channels for higher lvl maps but only limit world boss spawns on one channel.
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Adding more side areas with equally good exp rates. players like options and different places to grind instead of “oh, demon prison till you are 165”
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Improving and expanding equipments’ drop rates but reducing the amount they are worth to npcs. A successful grindy game usually makes players feel rewarded for grinding for hours, whether it’s money making or finally getting the gear or recipes they seek. Take maplestory as an example (yes I know I am comparing apples to oranges) but the grind actually feels rewarding in that game when you get items worth millions and leveling up in the process.
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More goddess statues just for convenience in travelling. I do agree that some zones are perfectly fine without a goddess statue, but running pass 3-4 maps to get to your destination can be tiring especially for the cleric and mage classes.
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keeping spawn rates consistent. Don’t give me a map with fast - instant spawn rates then slap me with a map where I feel like I have to compete with everyone for kills.
tl;Dr
I love to grind? 
