Well, we all have different opinions and expactations from crypto.
From my dexperience, when bitcoin grows alt coins grows even faster but when the bitcoin fall altcoin falls even faster.
I had some funds before invested in alt coins but I decided to move everything in bitcoin in order to preserve the value of my portfolio.
This is answer based on my experience.
If you monitor the only top 10 altcoins your decision was write. But currently we have many altcoins in crypto market so I see different types of falls in Bitcoin and altcoin. If you like Bitcoin it was your own decision but you complain the altcoins many supporting peoples available in this forum. If we concentrate our own decision that will be a good movement in any transfer.