It has been a while since I've been on the app update team myself, and while I could try to remember all the various reasons, there might be someone who can simply point us at an updated document. I'll n-i Kirk and Mike who might be more up to date on this. Failing this, I'll try to dig up the reasons that we've discussed in the past.
Bug 1872934 Comment 3 Edit History
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It has been a while since I've been on the app update team myself, and while I could try to remember all the various reasons, there might be someone who can simply point us at an updated document. I'll n-i Robin and Mike who might be more up to date on this. Failing this, I'll try to dig up the reasons that we've discussed in the past.