Adding all US tradable stocks, ETFs, preferred stocks

Why not cover full stock universe for exchange rather than this request mechanism? I am aware there are limitation for certain stocks for additional checks but with exception of those, what prevents to cover what has been offered by stock exchange? Is it infrastructure?
Generally research of stocks happen outside freetrade and it would be frustrating for users to see stock is not available to buy.
May be I am missing something but without coverage, I see a big challenge.

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