Is my CVT actually slipping or are they just kind of like that?

I'm not intending for this to be a CVT-hate shitpost, I am genuinely asking coming from someone who has only ever owned manuals and my wife's Outback with a traditional torque converter automatic.

I bought my forester used about a year ago (4th subaru, 1st with a CVT) and it's been fine. 2018, limited with the FB25B N/A, like ~80k miles now. Gutless as all get out, but sturdy and surefooted as I've come to expect from Subaru. However, it's just..slow. Like real slow. I step on the pedal, engine spins up, and the car slowly gets up to speed. I'm accustomed to a manual where I can feel the engagement and can tell if the clutch is slipping compared to the engine rotations, and it feels kind of like that, or if I have the clutch partially disengaged. It takes forever to get up and move (12-15 second to 60 at ~50% acceleration), especially when it's cold. I get really faint shuddering on acceleration but it's so mild it could be from the A/Ts I have installed. This has also been my experience with CVTs when I rent them for travel, so there's a level of rubberbanding and RPM drift during acceleration I just expect by nature of how they work, but at what point should I be worried?

I had the dealer perform a CVT fluid flush and service a few months ago and it feels exactly the same, but they didn't have any concerns and there's no lights or anything. CVTs are so expensive to replace that I've been watching like a hawk for signs of failure, to the point where I might just be imagining things. Is this just how CVTs are or does anything I say concern anyone?