Honestly, I never claimed to be an expert at any Civ.
Ive never been able to break the Monarch barrier and even then I routinely lose.
I scoured civfanatics a long time ago to learn more about Civ strats and tbh, its too much to learn. So I just enjoy the game(s) for what they are. I think I can speak effectively to the differences between 4 and 5, but I have always made two things clear...
1) I am not very good. Playing at Monarch level is noob-level and I dont win very often.
2) I do not play online and have no will to.
But I understand what youre saying about the social differences between 4 and 5....and youre right. You can hot-switch your entire empire in 4 from a warmonger to a cultural dynamo whereas in 5 the moment you pick, youre locked in for the rest of the game.
I treat the two games as different experiences. Is fully expanded 4 better than 5? Yes, undoubtedly. But to me theyre just different games all together. I like the new combat and have not experienced the Longbows/Cannon overpowered aspects you have, thats for sure.
But your understanding of the various methods of play are more on par with the civfanatics, and thats just beyond me...and I kind of prefer it that way. Civilization4 is a game I could never master, I never excelled at it and I enjoy it more because of that. I dont know if I am going to win or lose until almost mid-game....before then, its a toss up and thats why I keep playing.