Completely disagree, Mine has 20's on the slightly stiffer black edition suspension and it feels no different than when I popped a set of 18's on to have the 20's repaired.
Over the years I've owned many cars with 21's, 20's & 19's fitted all lowered 30-40mm and some polybushed. All I have to...
ended up going with https://www.smythstoys.com/uk/en-gb/baby/car-seats-and-bases/09-36kg-%7c-group-1-2-3/maxi-cosi-titan-group-1-2-3-car-seat-black/p/181946
with our 2yr old when she turned around... so much easier..