firstly, lack of blocking
The lancer has the saber to do the blocking for him, use it more effectively and this wouldn't be a problem. This is a skill-problem, not an inherent disadvantage of the class.
secondly, you underestimate the disadvantage that the medium horse brings when taken in conjunction with the lack of blocking
This ties in with what I said before: lancers do not lack the ability to block. This is again not an actual disadvantage of the class but rather the misuse of the class. A skilled lancer would not have this problem to the extent that it could be classed as a disadvantage.
furthermore, a soft hit with a lance is much worse than a soft hit with a sword, given the animation time of a lance being heavily weighted towards the beginning, so you have over a second in which you can't do anything once your lance soft hit
This could be a minor downside to the lancer class, but it's relatively insignificant on the larger scale of things when compared to other classes (who also have the same problem with soft hits).
furthermore, lances are more difficult to aim than a sword, making things like jump kills something that are much less reliable
Lances require just as much timing and aiming as any of the other classes, which can all be practiced and again amounts to a lack of skill on your part rather than it being a disadvantage of the lancer class as a whole.
Furthermore, you are much less likely to kill a horse in one hit with one hit with a lance, and the areas which do more damage like the head and belly are even more difficult to hit than with a sword when you consider the difficulty of the lance to aim.
This seems debatable, with enough speed a lancer is easily able to kill a horse with one hit. To add to that, they have the couch lancing ability which kills in one hit. A sword does not kill in one hit in all instances either and require the horseman to get very close to the opponent, whereas the lancer does not have to do this and can just keep jabbing away at a distance.
Furthermore, the lancer being extremely manouverable is a misconception brought about by the fact that the lancer can turn very far with the swing on the left side, which can be avoided by going on the right, and is not effective against multiple opponents since to get that manouverability you have to go quite slowly, and there for the falsely coined "manouverable" style of lancer play is incompatible with a team battle format.
I never claimed that lancers were 'extremely maneuverable', they have decent maneuverability at best. This is actually like you say, one of their downsides.
In addition, the couch is easier to fight than you think, since couching against a mounted requires sufficient predictive skills that not everyone has, and can also be out-ranged with a well timed swing. If you complain about being couched in the back, consider that you could be killed by a sword swing to the back also. Furthermore, there are effective techniques to deal with a slow couch if you are dismounted, which don't work 100% of the time, but neither does else
Couch lancing alone is not the problem, it is the multitude of options the lancer has to his disposal which makes the class unbalanced. If the lancer did not have the sword, for instance, the couch lancing ability would not be a problem because there would be no way for them to block. Is it relatively easy to fight once you get the hang of it? - Sure, but that does not make it any less unbalanced.
So what this entire essay of yours actually amounts to is misconstruing that which I had already pointed out in a previous post, and also pointing out that lancers require skill to use (just like any other class).
Furthermore, that's all I have to say about it. Lots of luck to the lancers this year
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