Bitcoin isn't complex at all. It's the most simplistic coin in existence, which is why people like it so much. It does all that people need, which is storing value and sending value from point A to B.

People don't need all sorts of gimmick features that no one uses anyway. It's about the quality of the tool, and the liquidity its ecosystem around it provides, and nothing comes even close to Bitcoin in that regard. The only downside of this is that altcoin whales cash out to Bitcoin, then dump Bitcoin for USD which has been a major contributor as to why Bitcoin has tanked hard this year and somewhat struggled to remain up.