Is it good practice to remove all of the plugins and themes that are redundant? Also, if so, why is it good practise to remove them?
To add to Mark's answer, often a plugin developer releases an update when a security hole has been found and fixed. If you don't update or remove these plugins, hackers will try and exploit this.– TomCApr 27, 2017 at 14:45
Always remove any code you do not use which is easy to remove, like unused plugins and themes. Too many times even an unused code proved to be a vector through which sites were hacked.
1Time to delete all those harmful inactive twenty-something themes. ;-)– Christine Cooper ♦Apr 28, 2017 at 13:31
@Mark Kaplun, may I ask you to have a look at a custom field related question here : wordpress.stackexchange.com/questions/265852/… / May 4, 2017 at 19:54