 Re: "Say Altitude"
Not sure if it applies to your situation, but not all towers have radar (i.e. most Class D). Thus the only way to know your altitude is for them to ask.
Also some facilities do not have radar coverage to the ground, so ATC (in this case a TRACON or ARTCC) asking for your altitude is the only way they know where you are at until you are "radar contact".
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