2011 automatic Scion tc engine brakes a lot?

My family recently bought the scion, and when I drive it and cruise around 20-30mph as the engine automatically shifts to a lower gear, it slows down as it does the shift and then goes faster after the shift-ergo engine braking (to an extent). I know engine braking is bad for the transmission err tranny, whatever the case. No automatic car I have driven has ever downshifted like that, that is to say the fact that I can feel the downshift in an automatic car. Or is it Scion's way of making its' driver feel like it's a legitimate sports car lol. (Even though it's everything but a sports car)-just looks like it, hey I don't complain when I pick girls in it.

Nonetheless, I'm just concerned as to how much of a threat does this pose to the longevity of the engine. When I was in the dealership with my mom, the salesmen even said that Scion was Toyota's way of attracting younger customers. As they get older, the main goal is for Scion customers to buy Toyota.

So in that case, my theory is that the Scion that we currently own won't last even 10 years as hoped for.

Please note: I have no knowledge in cars. Except for the fact that consistent engine braking in a car is bad. I know long time owners of manual cars use a combination of both engine braking and the actual brakes, that is to say, use the brakes to slow the RPM's to make the downshift smoother and what not. Feel like teaching me something about cars? feel free, it wouldn't hurt to learn something new