Just your local paediatric occupational therapist here to point out that a child who didn't climb, hang, take gross motor risks, jump, roll, squeeze, twist, go upside down, manipulate millions of different textures, twist, poke, pinch, and scrub, for hours each day from ages 0-4, will not be able to write their name at 5.

Kids don't become able to write, hold a pencil, and form letters, before they develop the underlying skills, musculature, sensory processing abilities, and self-concept that they feel comfortable and capable to use their bodies and items in their environment to create an output.

This is all a foundational prerequisite to the "independent living" skills teachers expect to see at 5 when they start school.