The use of function filectime() / filemtime() is discouraged

[diazwatson]

Rule

I saw a warning similar to this in my IDE the other day:

The use of function filectime() / filemtime() is discouraged.

It was not coming from Magento CS but from PHPCS which I am currently using WITH Magento 2 CS.

If this check / warning is already there, would not be helpful to provide developers with some guidance or alternatives on what they can use instead?

Reason

TBC: I am still doing some research to understand WHY the use of this is discouraged. I will complete this section with my findings.

Implementation

This guy proposes to use \Magento\Framework\Filesystem\Driver\File, same we are already advising to use to replace these kind of PHP functions.