I think another reason I picked Windcharger was because he was cheap. Maybe it's my inner socialist talking, but I always felt that the main character in a toy line should be a character that any kid (or their parents) can afford. Also, I don't think G1 ever established a POV character that had a toy. Spike Witwicky was the closest they had to such a character, but he only got represented in toy-form in 1987, and he was a component of the Fortress Maximus toy (a very VERY expensive toy back in the day).
I think the problem with Optimus Prime back in the day was that even though he was the main hero of the franchise (I can't think of anyone else), he was a very expensive toy that few can afford. A lot of kids I knew who played with Transformers who didn't have Optimus Prime would pick a random Autobot they owned (say Inferno for example) and assign him as the main protagonist and defacto leader. Later on there were other cheaper Autobot toys, like Rapido, who had the role of Autobot Commander, but they weren't as well-known as Optimus.
I think one of the cool things about the Legion class (formerly Legends class) toys was that they were smaller and cheaper representations of popular characters. It meant that any kid could now buy Optimus Primes and Megatrons without needing to save their pocket money for a whole year.
When I was a kid, I always wondered who was the ruler (or highest authority figure) on Cybertron in the G1 lore. Even though Optimus Prime and Megatron were the commanders of their respective factions, I couldn't imagine either of them as rulers. They're both very combative and hands-on (for a lack of better terms). I think to fulfil that role, it'd have to be someone (or something) that is not only very powerful, but someone who thinks of "good and evil" as a trivial notion and only cares about the survival and prosperity of the whole Transformer species. Sunbow and Marvel Comics eventually expanded the G1 lore, and the role described above was eventually filled by Vector Sigma or Primus. But I think if we were to represent the Transformer king as a toy, it would have to be a toy that transformed into something big and majestic, like a building or monument. Definitely not a truck or gun. Metroplex seems like a good candidate.
One thing I notice about Transformers is that they're always assigned factions (Autobots, Decepticons, Maximals and Predacons). I don't think I've ever seen a factionless Transformer. I don't think there's been any lore that described the Junkions as Autobots, and yet all Wreck-Gar toys are always labelled as Autobots. Titans Return Gnaw is labelled as a Decepticon too, even though Gnaw's loyalties mainly lie with whoever feeds him regardless of their faction. I think if Hasbro created a third faction early on in the franchise to represent the factionless/neutral characters, probably the likes of Junkions, Sharkticons, Unicron and the Primes (Solus Prime, Alchemist Prime, Prima, etc) might be assigned to that faction.