[Kala1928]

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Against weak players you should be willing to play relatively cheap pots preflop so you can realise your greater postflop edge later in the hand. Against strong players you want to get as much out of your positional advantage as possible by reraising preflop

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This is just silly.

Its good to 3bet to isolate weak/bad players.
Its not "increasing your positional advantage" when you reraise preflop.
By 3betting a good opponent when weak players are yet to act behind you effectively just shut everyone out of the pot except the initial raiser, unless someone wakes up with even better hand. Which is bad.