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There are many reasons to allow us to define the order of app installation. Some apps have dependencies. Some apps might generate a restart, so we want to install them last. Some apps might install in parallel, so long running installers should be started early in the process. If lots of customers keep asking for it, it should be on your roadmap, surely? "The customer is always right"
I have been asking for this for years. At my current job, I haven't had anything that needs this, but my previous role we had several scenarios where application install order was key and simple application dependencies did not work. I agree - Microsoft really doesn't listen to their customers anymore.