Not at all. A common railway gauge is necessary for different parts of the rail network to be joined together. If one section of the network has a different gauge, it is cut off and can not be joined without being completely replaced, leaving you with two less capable rail networks. Everyone does benefit from a more capable rail network.

Further, rail gauge is not a consumer choice. If there were two rail gauges and your local rail station happened to have a different gauge than your destination, you'd be SOL. A different rail gauge may provide benefits for people with specific needs, but you don't get to take advantage of those benefits except by blind luck.

There is no such benefit from standardizing cable connectors. If someone charges their phone with the same style cable as you, you gain nothing. If someone uses a different cable, you lose nothing. There is no reason for anyone not to use their preferred cable which is optimal for their use case.