This episode Revenant has been very short and repetitive so far, but imo what makes it so frustrating and annoying is the tonics system. Aside from a few boosts here and there, it has no benefit what so ever.
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The problem is - like so often - a deliberate design constraint. The rate limiting ingredients are enriching flake (onslaught), tomb flake (tomb of elders) and reflective flake (Kell mission). By purpose these drop in low quantities and hence force into endless repetitions of seasonal activities if you want to unlock/use all tonics. Not difficult but very time consuming. Intentional.