When is the right time to increase validator count on Polkadot / Kusama?

Title says it all.

Kusama and Polkadot have had the same validator count since their inception.

What are the advantages and disadvantages of increasing the number of active validators?

If we decide we want to increase the number of validators, what are the metrics that we should look at to indicate this would be safe for the network?

What is the long term goals for Polkadot and Kusama in this regard? How many validators is enough to provide a trust-less, unstoppable pool for the multi-(para)chain future?

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