Afraid of the new Ascendancy Classes

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Deadpeng wrote:

For those of you who were not here 2 years ago, Path of Exile used to be a game whereby a witch can be a Facebreaker puncher while a Marauder can be a spellcaster.

It still is, and ascendancy classes provide powerful new options for off-class builds as well - a spellcasting marauder is now more likely to play differently than a spellcasting witch, for example, due to being able to take advantage of the extra tankiness of the Juggernaut - a class for which only one of the big nodes (Undeniable) is explicitly limited to attacks, and one other (Unyielding) is implicitly pushed towards attacks due to them being easier to get fortify on.
Every other large node on that tree (and half the small nodes) is just as effective on a tanky caster as on a tanky archer, tanky bowrauder, or tanky melee character. This is intentional.

Keep in mind as well that there are two more ascendancies yet to be revealed for the classes you mentioned.