This game lacks the experience, too casual?

[Clavaat]

Roulette gives enough myth, combined with dailies and they could even just keep spamming CM and jump right into i90, skipping over CT and even most of Coil. With how old coil is now, they could technically skip right to t5, get lucky, beat it, be right up there in t6+ now. So yeah, they can skip right over it.

Try doing T5 in all mythology or soldiery as almost any job. You will miss like crazy, or not do enough damage. Myth gear is not a true substitute for BC gear in some cases, and vice versa. Not to mention there's the whole skill factor which only comes with time. There's no such thing as a carry through T5, everyone needs to work together properly. Even with the Echo Buff, it's still very unforgiving should you make a mistake.