If you earn more than $523,600 and are single, then your tax rate is not 50% but 37%, which is still meaningful amount that is often not considered when looking at those big numbers. https://www.manafld.com/blog/2021/2/26/rsus-no-sell-tax
If you are in California, then your employer will not give you all your RSU but sell 40% and give you 60%. So you don’t have a big scary surprise when it’s tax season. https://blog.myrawealth.com/insights/rsu-tax-rate