I suspect that the idea originally was to give some safety valve but if it is used more than a few times by a President, it makes a mockery of it and it should be removed as a power. How can a President ever decide that the entire legal process is flawed and their opinion is right? If the sentence was too long then change the sentencing guidelines.
Don’t dress up your stance in fancy garb when it comes down to something baser.
What you are doing here is a distraction from the topic - whataboutism.
This is like crying about whataboutism when a judge cites judicial precedent to justify a sentence. Good luck with that, it might work as a "nuh-uh" in online discussions but in real life, precedent does actually matter.
Biden did bad pardons, now Trump has no other course (eg fix the system), but to do bad pardons as well? Except when Trump does it it is not bad because Biden did it first?