I see you picked one...the fact that you did so evidences your doubts and or your agreement that pretty much any reason can be manufactured to discredit God for not giving us the the truth He wants us to know.
The problem however is not what isn’t in the scripture you might think belongs there, or perhaps find from some other source which would justify to yourself beliefs you want to have included,... the problem is not accepting what is there as it is and learn from it.
There’s a reason why cults and false religions want “added” books, added traditions to be included....and it is not to learn to know Christ better and Love Him more....it is for selfish ambitions and that which substantiates what they “otherwise” desire beyond what He’s given.
i asked two questions that apparently you are unable to answer. i am not suprised.