Why is bitcoin considered the main one and its price not crashing from the threat of these other more equipped coins?
I wouldn't mind if you give us a comprehensive list of the coins you claim are better equipped than the bitcoin, as far as I know, no alternative coin has the capability to compete with the bitcoin, no alt is even a threat to bitcoin.
Bitcoin is the main coin because it's the first, most stable, has the highest value and is the top of the cryptocurrency coins.