The scenes in the isolation chamber in underwear applying gel to each other were totally unnecessary

I thought so at the time but later realized that was a key scene of the whole entire show. You missed a lot of the nuance. That was where T’pol developed her crush on Trip. Her crush on Trip was the only reason she became the first Vulcan to be able to stay aboard a human ship for longer than a few weeks. And T’pol’s presence on the ship advising Archer was what made Archer so successful in laying the groundwork of the entire federation.