Sacrosanct
Legend
Depends what kind of fighter you want to play, what kind of adventure setting you are planning for, and what kind of ranged support you can expect from the other PCs.
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I suppose it depends on the type of game you're playing. And there's no wrong answer there.
I try to build characters around a concept. I visualize them, think about them, and then work the abilities to try and match what I have in my head; mechanical options should support what I want, but does not drive my choices. I am comfortable, for example, discarding proficiencies gained by race or background if they don't fit. From that point of view, it is hard for me to imagine playing a fighter (or any fighting-type character) that "dumps" in either strength or dexterity; a 12 (for example) would be the absolute minimum for a character that was above-average, and fighting characters should be above-average in strength and dexterity. Even, say, an archer- I mean, longbows (to use an example) do require some strength.
What these good folks said. It's never stupid to play a concept you think you'll have fun playing, even if that's a swashbuckling duelist who is also a large brute of a man. Porthos anyone?
What's stupid is limiting your options in a game all about imagination because someone tells you that you're not metagaming enough.