It's time they changed weekly tomes to include different jobs

[Enkidoh]

You're failing to understand exactly why the roulette system is in place in the first place, it's not to reward you with tomes and exp, that's just a carrot, the whole point of it is to help those needing certain content who are trying to queue for it but can't otherwise get players interested to help them (specifically, older content).

The reason why the 'adventurer in need' bonus is virtually always tank is because there is a DPS imbalance in the game - there is just more DPS classes than tanks and healers, made worse by the two new Stormblood Jobs being both DPS, so that only adds to the problem.

And it is not a simple matter of "add more tank classes then!" - Heavensward showed that players will still preference DPS classes if given a choice (which had a DPS, healer and tank all introduced, and there were more levelling MCH than AST and DRK), so no matter how you look at it there will always be a need for tanks. The roulette bonus is just one way to encourage it.

Yes it makes it hard to level DPS classes but there are other ways to level (FATEs for one, especially with those exp bonus mechanics SB area FATEs now have), if you're using roulettes exclusively to level you're going to have a hard time (I'm sorry for rehashing that tired meme though).

[Orbiaus]

Hit character limit, had to delete (SE please use a modern forum system please!)

I think you misunderstood my post. I have edited it slightly to make it clearer.