I am having a similar experience. I picked up a 2018 Impreza Limited 5-door 3 weeks ago, coming out of a 2014 Mustang GT with Koni Yellows, springs, sway bars and rear LCAs. The Mustang was about to hit 93k miles, my daily commute is now 90 miles instead of 30, and it was time to do the responsible thing and get a nice, economical car and pay off some debt.
The Impreza is fairly comfortable but also pretty tossable, but there is a real disconnect between the very fast steering ratio and the soft rebound dampening. There is more high speed compression dampening than I think is necessary, which is why there is some impact harshness on frost heaves and potholes. However, there is not nearly enough rear rebound dampening and/or too much rear stiffness; presumably to try to tune out some of the AWD + nose heavy understeer. Over larger imperfections in the road at high speed I feel a second compression/rebound cycle in the rear of the car only. Over rough road, the whole car does feel very floaty. If the shocks were adjustable, I'd dial out a little bit of compression and make a big swing at rear rebound. The stock springs are pretty soft too, but I wouldn't change them as spring stiffness isn't really a problem and I don't think most people are going to be driving these to the edge of traction anyways.
The steering, while very quick and pretty fun to run through corners, feels artificially heavy, which I don't love but can live with. EPAS tuning is a bit of an art, and very few manufacturers have gotten it right, and even then not on all cars. It took me a few days to get used to the ratio on the highway, but it doesn't really bother me anymore.
As an aside, I am having a small issue with caster and/or toe. My car has 1500 miles and since day one, when I picked it up with 38 miles, my steering wheel has self centered a few degrees off to the left AND the car pulls to the right when centered. The steering is also heavier turning right than left. Granted, I am 290lbs and that may be part of the steering weight/centering issue, but the car shouldn't pull to the right with the steering dead straight either. I asked the dealership to look at it, they gave me the car back with absolutely no change. I'm going to have a shop put it on their rack to verify the alignment at the first oil change. I might ask for a little toe-in to even out the weighting issue. At 25k miles a year, I can't afford to burn up tires due to a wonky alignment.