I also don't see the need to change things, let's say you eat some bad food and are feeling rotten, having your lower gears might be nice when you are feeling queasy, it's hot and you have a steep hill appear in front of you.
It's your time and money, but unless your bike presently has shifting problems, why change it?
As others said, I don't see a downside to your gearing and if you don't use the lowest gears, that's OK.
I guess if you feel it is really really too low of gearing, switch your cassette to a closer spaced cassette with a smaller large cog, you will like the closer shifts.

Have fun doing whatever you chose, but it comes down to you evaluating if you want to spend the time and money....