I think one of the reasons why Bitcoin trading is the best and the best is that when one trades only Bitcoin, his profit will be less than other coins or tokens and vice versa the chances of losing from other coins or tokens will be much less.
I don't think that's the situation everytime. If you fail to do the correct analysis, you will lose big time. In every trading situation, you should have a fixed stop loss position. Doesn't matter if it's a BTC pair or any other crypto. You can control your loss at any situation, only if you have the right strategy. And always remember, trading comes with a high risk. There's a certainty with BTC pair and I agree with that. Other than that, you have to take in consider of every risk.
Do you think there could be anything other than Bitcoin in terms of long-term planning?
No, Bitcoin is the best bet if your plan is for a long term investment. Every other alt coins are centralized shit. So anything could happen to them at any
given time. I will never choose anything else if it's for a long term investment.