One: respawn timers and locations need a adjustment, I completely agree.
Two: If your theory about people playing smarter on a x5 than on a x1 was true we would see such in battle and standard siege. I have never witnessed that myself, especially in siege (keeping in mind more than 50% of my total earned xp has been from siege). If a team was non-pub and organized I think your theory would be very accurate, but as it is I have very rarely seen anyone try and communicate tactics to a team (when they do they tend to be ignored).
Also:
While you were sitting afk in attacker spawn for an hour and half last night, I was playing the whole time, and I did not go through a single map where the attackers did not capture at least 2 flags. The first 2 or easy, then most of the round occurs fighting over the rest, hence:
Arguably communicating tactics and playing smarter, or with more of a purpose are two entirely different things. If you're sitting in a clan's TS, odds are they will be a lot more chatty on an x1, and when defending their x5 they will be a
little more serious, or maybe even try to strategize.
Also, as attackers it is usually easy to capture two bases, agreed, but the 3rd one always proves tricky since for whatever reason it is essentially the defender's last spawn point. Sure they could spawn elsewhere (I think) but would be foolish to. There is really no difference between the 3rd point and the last (and 2nd to last, at least on one map) in terms of difficulty to take, other than any map-given advantages defense might have. It just wouldn't be fair for the attackers if the same setup was maintained where defense gets 2 or 3 "last points" to defend. The first two are easy to take, the 4th and 5th, likewise. Other than that, defense has a huge advantage.