Say you join Anthropic now as an employee. What are the chances of your equity appreciating in value? I don't think we have any historical precedents to this.
So you're assuming lots of risk and putting it all in the same basket.
There's no shame in getting 100k $ worth of stock, selling it and putting it on some vanguard fund and diversifying, in fact it's statistically the best move you can do.
Of course, you can be like those many googlers that did this and then regret in hindsight.