When talking about dominance, we should look at how acceptable the coin is. Which coin is more acceptable as a means of payment?
Also, the popularity of the coin. Even though only a few percentage of the world holds bitcoin, a lot more percentage of the world know about bitcoin. They may not understand what it is, but they know bitcoin more than any other altcoin. There is no way you will know crypto and not know bitcoin, but you can know bitcoin and not know other altcoins, that's dominance.
We can even look at the coin with superior features. There's a reason big corporations choose bitcoin as their asset, and rumours of countries talking about bitcoin reserves. That's dominance.
Even Bitcoin is still the highest. And this is enough to prove that Bitcoin is the most dominating asset.
One of the advantages of Bitcoin that distinguishes from other coins is the amount that is fixed and can no longer be printed to increase.
Let alone 19 million or more coins or tokens that continue to be made and available in the crypto room as you say, so it increasingly makes Bitcoin dominating because of the dominance of birth because of the recognition based on functions and other things that people get in Bitcoin. The most common is that people can compare the best coins from the good.
Altcoin a lot so people will judge one or more to be chosen. But if you compare Altcoin with Bitcoin, only one Bitcoin is BTC.