It is imperative that you pigeon hole your opponents as rapidly as possible because this will allow you to devise optimal strategies to beat them.
Let us take an example from NL100 ring poker game to show you what I mean. A player has raised before the flop and bet the flop of A-4-6-2-9.
You called pre-flop and called their c-bet on the flop and turn with A-K. On the river they shoved all in and you both started with 100bb before the hand commenced.
Now here we cannot possibly answer the question without further data about our opponent. For example then if this was a full ring game and our opponent was a rock then the A-K is worthless.
We probably should have three bet pre-flop and the flop call was fine but against a rock then the turn call is more marginal.
However against this category of player then the river is –EV if you call because of the fact that rocks in full ring will only tend to stack off when they have a powerful hand.
So you have A-K and so they are unlikely to have A-A but if the raiser came from say middle position then they have probably hit a set with pocket sixes or hit their pocket nines on the river if there is no flush draw present.
One pair hands would have gone into pot control and two pair hands are unlikely given the board configuration as are straights.
They may have A-9 but a rock wouldn’t stack off with that hand. Now change the scenario to one where the game is six handed and your opponent is very aggressive and triple barrels a lot looking for fold equity then you can certainly call with the hand because your opponent will be holding fresh air an awful lot of the time and their range will be polarised.
You tend to find these betting patterns with loose-aggressive players who look to try and force weak tight players away from hands when they have marginal holdings. Poker and playing poker well is all about adjusting to what you are seeing in front of you and even readjusting and hoping that your adjustments happen before your opponents adjust to you.