Just for the record, I don't think that certain potion buffs should be specific to parts of the game.
However, if you're going to add more powerful potions which are available to everyone for essentially just logging in over time and doing a few easy DQs, you're really going to discourage people from trying out different parts of the game.
If you start adding in level 600+ leveling pots you're going to discourage people from donating to get the free epics chests. Yes it's true not everyone can donate, but if everyone had access to the same things anyway then why would anyone donate at all? 400 fsps doesn't get you a lot upgrade wise so these epic pots are always an incentive.
I think it would be a good idea to still offer these buffs as loyalty potions, just change the levels so that they don't outclass potions earned from other parts of the game. For example, make the Brewing Master pot level 250. Level 500 for 500 tokens is crazy, you'll have people with thousands of tokens never wanting to use anything less than level 500 again.
I'm really struggling why some people are so keen to get easy access to these mega powerful pots? Sure, we'd all love to be using uber pots all the time but if everyone is using them then how do HCS go about offering new potions in the future? Make them more powerful yet again?
It's a game. It's a competitive game. Literally the entire game and the majority of its aspects are rooted in competition. Earn your medals, climb the top ranked boards, win your pvp ladder, win your pvp arena, capture that other guild's relic. Adding crazy pots which take the incentive from participating in other parts of the game is just silly. It's a recipe for disaster.
Again, not saying we shouldn't add these buffs but PLEASE just make them a bit more reasonable so as to not make other rewards from other parts of the game obsolete.