ENS names are going through an interesting phase. 

Original vision was one name everywhere, but L1 got too expensive so people have offchain ENS (farcaster) and L2 ENS (base names, world names). 

The natural progression seems to be towards multiple ENS namespaces - is this a net good thing?

Technowatermelon. Elder Millenial. Building Farcaster. 

nf.td/varun

No, I think that multiple names do not help to identify one person, for example, if you know a person named henry14.eth, then in the Base blockchain it can be henry1410.base.eth all because you did not have time to buy your main name in time. This is a big problem.
I think that everyone should have one name regardless of the network. ENS is one of the indicators of humanity

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when a user has one name, but if the sites have the ability to save this name for this participant in their network - this is the best that is possible