Is Healing Necessary in Pathfinder 2e?

It's the age-old question in RPGs: Does every party need a healer, or can a party function without having someone forced to perform this role. In this video, I show that while certain types of healers are necessary in Pathfinder 2e, no one needs to warp their build too much to be able to contribute to party healing.
Please let me know your thoughts and how you worked through the homework given in the video!
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Music by Oleksii Holubiev from Pixabay
Music by Denys Brodovskyi from Pixabay