As you stated, you got your answer.1. Was it a tactical warlord? and
2. Why you do this?
Did everyone have similarly combat-bad characters?
Nope.
I did it because the stats reflected the PC concept.
So, why do it? Why would anyone do it? Do you believe you're a better roleplayer if you do that? Do you believe statistics must match character concepts in order to be playable?
The quality of my roleplay varies from hour to hour, and while I think I do a decent job, I'm not objective.
I DO believe that stats should match character concepts, and I base how I roleplay the PC based on that. Despite my IQ, I play my Int6 PCs like the dullards they are. When I play a PC with a stellar Wis, I don't act on my first impulse when the path of action is unclear, but rather put it to the table (DM included) "Does this sound like something 'PC X' would do?"
IMHO, if I didn't match stats to PC concept, I'd be cheating.
I mean, while you may certain expectations about what it takes for someone to do something, it isn't necessarily so.
Lets just look at physical size.
While you'd like your NFL QBs and Wide Receivers to be 6'+, Doug Flutie, Wayne Chrebet and "The Smurfs" receiving core of the Washington Redskins (none more than 5'10") did just fine. At a fudged 6'1" 203lbs, Bill Bates, Cowboys legend, was too small and too slow to play his position...but did so for more than a decade, winning Superbowls and Pro Bowl nominations while doing so.
At 5'7", Spud Webb played in the NBA...and won Slam Dunk contests. Muggsy Bogues, at 5'3" was a vital part of the teams he played for.
So, just like being taller than average isn't a requirement to succeed in the NFL or NBA, it isn't the case that a PC must always have his best score in his class' key stat to be successful (IOW, making a positive contribution).
It looks like he wasn't actually "combat-bad" -- he was an archer, built using the Fighter class, so his Dexterity was high but his Strength was 10.
He's playing silly buggers with the language, since the primary attack stat of any 3.x archer would be Dexterity*, not Strength.
I'm not playing silly buggers. It was a 2Ed campaign with rolled stats. 9 was the minimum Str for fighters, and my PC had a 10. While Dex was the primary attack stat, you realize that he was giving up huge amounts of damage by not placing Str to at least 2nd rank.
And, point in fact, his stats were Int & Dex (both 17's), Con15, Wis 12, Cha10, Str10. He was a warrior whose strength was cunning plans and battlefield command, not wading in to battle and swinging an axe. Small but tough, he had earned his keep as a militia archer before going adventuring.
So yeah, you can play a great low-Strength Fighter and do just fine... if you are an archer, or if you use Weapon Finesse + some kind of precision damage.