Would it be a satisfactory quantity if I had 0.1?
That depends on you. If you are satisfied with it, then that is your goal for investing with that amount of Bitcoin. Everyone probably has different satisfaction levels when it comes to investment, but I think having 1 BTC is quite significant. For the average investor, holding it for the long term could bring happiness. One day, if Bitcoin reaches $1 million per coin, you'll be a millionaire at that time.