What they should be worried about is Kyllo v. United States[1]. When data collection is sufficiently normalized such that general public no longer expects privacy - crossing the bright line that currently makes police using the same type of data collection technology a search that requires a warrant.

If this it becomes commonplace for text editors to spy on some types of (meta)data, a warrant may not be required for the police to gather the same type of data without a warrant even if you do not use a "common" editor.

[1] https://en.wikipedia.org/wiki/Kyllo_v._United_States