Our release is from April 2020. So this is not too old. You can not compare a manufacturer specific kernel with the latest mainline kernel.
At the moment we are busy doing all the releases for our i.MX8 boards. These releases are based on kernel 5.4.70. If this is done, we want to update the i.MX6 boards to this version, too. However there are no specific release dates planned yet. The i.MX8 releases require lots of changes to have everything work as similar as possible to our other releases, so it is difficult to estimate when this is all done.
