@keithpp @CobaltVelvet I don't think it's any more fatal than the fact there are lots of John Smiths in one town or another. At least here there is only one per town (instance). People deal with that fine in real life, why not online. This also remove the feeling we need to have a globally unique handle for everyone to know us. That's not feasible with 7 billion people. When you see post from the truncated name you can then click their id to see the instance. It's a natural thing to me.
@keithpp @CobaltVelvet Yes I saw that in your post, which is why I mentioned that I look up people's id often by clicking to see their instance. You're right that this is how it works. I only disagree that it is a fatal flaw. I think it is how many systems work and people are able to understand it. Frankly there are even weirder things about Mastadon that may limit it's reach, I don't think this will be it. But I think many people on here don't care if it takes over. It can exist at any size.