First of all, great thoughts, Villeneuve. Thanks for writing in my native language and, I regret that I don't read or speak French.
I salute you.
Second, a possible theory with regard to why Hougemont was not by-passed instead of attacked: under the doctrines of that period of war, it was very bad to allow an enemy force in good order to get behind your own front lines. So, if Hougemont were by-passed, that would leave a good number of enemy troops behind French lines.
I realize that Hougemont could have been sealed off and besieged and by-passed at the same time, so, my theory is only speculation, because it is not an obvious reason why the direct attack occurred.