i personally feel like the season journey is fast to be honest. especially with the smoldering ashes that buff your progression. Of course just a feeling.
as to if its worth it… i mean, noone can really answer that for you.
Some people are born with luck, do a few tormented bosses and get their mythics. others arent as lucky and happily rely the secure sparks from the seasonal rewards.
That being said, the season is still young. theres no need to be in a hurry.