So between His journey to the Temple as a 12-year-old and the beginning of His ministry in his late 20s, Jesus didn't do anything that could be considered relevant to or useful for our human existence? He had no romantic feelings towards any woman despite being fully human? Yes, I know that He voluntarily made His human nature obey His divine one, but even so, it would have been interesting to find out how He dealt with a wider variety of human emotions.
Presumably if whatever Jesus did for that time was something we needed to know about it would have been recorded somewhere.
Perhaps he did have romantic feelings towards a woman. The fact that such feelings, assuming they existed, aren't recorded indicates they aren't relevant to our spiritual lives today. Had Jesus been particularly enamored with the butcher's daughter in his teenage years, what of it? How would knowing that help our spiritual walks today, beyond potentially reining in a few of the fringe groups that think any form of attraction is sinful.
As for your second argument... Christians didn't make a habit out of going out on boats in the middle of a lake just to get some rest because Jesus slept on a boat, nor did they stick to wearing 1st century Jewish mantels because The Bible mentions Jesus having worn one them. You don't come across many Christians who say that they might not love their neighbors, but at least they attend weddings cause Jesus attended one.
Perhaps, but 1st century Christians also didn't argue over how many angels could fit on the head of a pin or whether Christians should drive cars or use the internet or listen to rock music or any of the other silly arguments that resurface every once in a while. The people who come up with all sorts of lame arguments that very loosely lean on Scripture but ultimately boil down to demanding everybody lives according to their preferences would have a field day if it were recorded that Jesus liked to listen to a particular style of music.
People might not explicitly argue that they don't love their neighbor but they do (whatever) so that makes it OK. At the same time you'd be surprised how many groups of Christians can be very closed-minded towards people who aren't like them. I personally know a guy who lives not far from me who visited just about every church in the area and all but two of them rejected him because he is divorced. I'm not quite sure how that translates to "love your neighbor as yourself" but presumably in the minds of the people at those churches Jesus added disclaimers such as "unless they are divorced".
