You do realize I have several digital titles that are 4K with HDR/Dolby Vision and some with Dolby Atmos that have never been released on 4K/UHD disc. I even have several HD titles that only had Blu-ray releases with Dolby Atmos audio.
Each home video format has its pros and cons which is why...
By the way, my HD stream on iTunes automatically upgraded to 4K/Dolby Vision without me redeeming the digital code, but without Dolby Atmos. Luckily, I pre-ordered this 4K disc when Amazon dropped the pricing down to $16.99 several months ago and I now have the disc in my hand as I type this post.