It's not just the appointments, it's the delaying of appointments in other presidencies - that's why Trump got that opportunity, that and a bit of luck. It's also the reason why Stephen Breyer is stepping down before he goes the way of Ruth Bader Ginsburg, allowing Biden to appoint someone before Trump does so in 2024 
The manipulation of the appointments has been going on for years prior, as outlined in the linked article.

The manipulation of the appointments has been going on for years prior, as outlined in the linked article.
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