Ok, I'm going to devulge a little bit about myself. I was a QB in high school. I had a medium arm strength. To throw a really deep ball, I had to put everything I had into it and use a high arc to get it down field. My senior season I was replaced by a guy with a stronger arm. When I whined about it to a couple of my friends who were WRs they told me this; his ball, with with a lower arc and more speed, was easier to find, easier to judge how much they were being lead, didn't cause them to slow down, and, as such, was easier to catch.
I like the way Chalich plays. I think his running ability adds an important dimension to the offense and he should be utilized. But watching his deep throws reminded me of high school. It was obvious the WRs were having to slow down or otherwise adjust. The throw to JLM was great, but it was pretty much overthrown. Without his speed I don't think he would have gotten there to make an amazing acrobatic catch that he had to twist and track over his left shoulder. The other WRs, esp Curran, also made some outstanding toe tapping catches. Watch the NFL. The only time you will see a ball float, usually, is if it's a timing route into the corner of the endzone. Other wise they are rockets. There's a reason for that.