Every programmer knows the urge: scrap everything and rewrite it from scratch.
It’s not that the existing code is bad. It’s that it’s hard to understand. Reading code is harder than writing it – you wrote the new code in your head, but the old code belongs to someone else (or to past you, who might as well be someone else).
This is why every developer on your team has their own favourite way of splitting strings into arrays. Writing a new function is simpler and more enjoyable than learning how the existing one works.
The temptation is real. Resisting it is part of the job.