What are the justifications for the marriage between the Prophet (SAW) and Aisha (RA) in regards to my claims below?

For the past year ive kind of been questioning whether to believe in Hadith or just solely the Quran. For me there are 2 types of people, the people who try defend it by justifying the marriage and those who try deny it with other Hadith. Regarding the latter, the talking point is always how Asma (RA) reports show she was older or Ibn Hisham’s Sirah show it but the Hadith are Sahih regarding this issue and one even talks about her playing with toys which is forbidden for adults. This is just a hard to defend point and the one way for me to truly accept this is to just deny Hadith altogether which introduces other problems. The first point is the main one though. I see some people say that back then women use to mature earlier which is biologically wrong. Another talking point is how the prophet (pbuh) waited 3 years and how only 100 years ago it was banned in Western countries. This to me is another poor point that I just can’t seem to accept, God is All-Knowing and All-Mighty. Allah (SWT) knows that in the future child marriage will be regarded so and so and back then Allah (SWT) knew. Child marriage is not only psychologically harmful but physically too and Islam also forbids harm if I remember correctly. Also, just because puberty starts it doesn’t make someone an adult they still have to go through the whole of puberty and even then most are still regarded as kids. Even in the future if the age somehow goes up to 25 for being a kid, Allah (SWT) knows this and would’ve prohibited it all the way in the prophet (pbuh) time since He knew it would happen and that child marriage is harmful. Islam is a timeless religion yet this thing is permitted and I just feel like I can’t accept Hadith anymore.