Why I against altcoin and prefer Bitcoin:
Lower popularity and smaller market cap: Altcoins have a smaller investment market compared to Bitcoin. Bitcoin has generally hovered around 40% of the global cryptocurrency market since May of 2021.
I don't quite find altcoins fascinating but I don't agree with some of your explanation. An altcoin may have less popularity which is right because it's new but ignoring them because of low market cap is not valid reason why they should be neglected, they are even more easier to make x10 than to make that in Bitcoin if you know understand how altcoins are shill and exit strategy when you had enough profits bu I don't just like them from my own personal reasons, they are not real to me.
A good practice I will recommend for all expecially beginners is that they should invest mostly in Bitcoin as this is highly save for the future.
Altcoins is full of deceit and lies, the team are very manipulative and if you are not careful, you will get caught up in there games, it's better to avoid them without even thinking twice, they may look profitable until you had loss from the market.