In May of 2022 took part in a roundtable discussion with Revenera (InstallShield) on the topic of MSIX from a ISV and Enterprise perspective where we discussed interest and adoption.
https://info.revenera.com/IS-EVNT-Unpacking-MSIX-2022

I created the below video to highlight the many features that have been consistently coming to AdminStudio with each release since the very begining.
And in the Packaging Expert Roundtable series I do every couple of months, we often have MSIX information in every such session and for every few sessions we have a heavy focus on updates around MSIX.
https://info.flexera.com/AR-WBNR-Series-App-Packaging-Experts-Roundtable