Also, even a +5 bonus only makes a difference in 25% of combats (against a single foe).
And then the combat might end not after your last action, but after a different last action:
If you had 1 to 2 more AC, and maybe some extra hp, it might actually mean, you go first, but your foe stays alive after your action in a certain round and you go down. So no extra action taken.
That still does not mean, if you are a medium or light armor user, that you should go str over dex. But for actually being in a fight, I often place a higher value on con and str, because I am not comitted to raising my single best stat at every opportunity.
As an example: for a dex character, it is hard to justify taking the dual wielder feat. For a strngth based dual wielder, that feat is actually quite useful. (At least as useful a dual wielding build can be).