[Praxising]

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i don't agree that there's "only this one hand" at all.
the longer you sit at a table, the more "meta-game" stuff
should start coming into play, ( seeing betting patterns, etc... )

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I agree with you entirely - and there is still only one had. But what I mean by that is: your decision about whether to enter a pot, bet, check, fold, raise whatever, must be all about that hand. It isn't about wanting to win back money from a previous hand, or keep money you've won, or any other thing. It's all about what is going on right now in the dynamic system of the hand. (And, of course, to that moment you bring with you all the poker tools you possess, including whatever info you have gathered on opponents at table or whatever it might be, as you said.)

You sound like you are a pretty advanced thinker - maybe without knowing that. What you say is also what the book says - if you are playing well, you stay in the game, whether you are, at some random moment, winning or losing is just not relevant.