Excellent post! I'm personally having about 20 wallets on my phone. Orangepilled tons of people over the years and need the wallets to guide the less technical users.

One thing to the multi coin wallets that needs to be mentioned - the attack surface. A single coin (Bitcoin only) wallet contains much less code so any bug is easier to spot in the source. A multi coin wallet contains much more code - much larger chance for a bug to stay hidden.