Whenever pasting text, it will carry some of the formatting from it was copied from. So, if the text had white color applied to it, it will show as white in the platform and using the color picker won't change the color. A lot of users copy from excel sheets which usually have HTML in them. This will turn into an invisible problem for the user.
Removing all formatting when pasting text is what is expected and if there is a way to do so without disrupting any other flows, I think is ideal.
