if it's the last thing someone (ever) does
if it ain't broke, don't fix it
if it comes to that
“If it ain't broke, don't fix it.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/if%20it%20ain%27t%20broke%2C%20don%27t%20fix%20it. Accessed 4 Oct. 2023.
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