the "hard" part about finale is the note spam / burst / criss cross apple sauce near the end (comparable to "The ol' jitterbug" as well), which is relatively easy with a little bit of practice
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there's a few reasons i can think of:
1. I played minecraft 1.8 for years (lotta spam clicking)
2. I've played the "Through the fire and flames" map way too many times (which goes up to about 13 notes per second, 26 if u count both left and right)
3. mechanical keyboard maybe? (I can still do "spam maps" on my laptop but a mechanical keyboard definitely helps)
4. idk practice jitter clicking or sum