Just to be clear, I'm not going to do this, but I was thinking about what would be the difference in using diono's angle adjuster for other car seats. Is it because it hasn't been crash tested with other seats? Or is it the principle of the thing that we don't encourage use of aftermarket products for seats they were't designed for? I assumed that the angle adjuster (I use one for my 16 month old's Radian) was to simulate a more angled seat bottom. Any thoughts?