Oh man has the argument against using NULL come out strong in event years.
It started with the inventor of null, Tony Hoare, calling it the Billion Dollar Mistake in 2009.
And everyone has piled on since. No one likes the NullPointerException.
See this tweet, showing everyone is jumping on this bandwagon. https://twitter.com/yegor256/status/835854965721694212
This blog author decided to take on this argument from a different angle, somewhat amusing, still thought-provoking: Optional Method Parameters via @DZone