MK4S or personal DIY

Hello, I am currently 14 years old and I’m starting to feel the need for a 3D printer and my father wants me to buy individual parts and build it myself to gain experience which I’m with but I’m trying to convince him to buy a MK4s and I’m almost there but I need reasons to make him 100% convinced that a Kit is better….. Or am I wrong? If it is better to buy a kit please I need professional notes why buying a kit is better or why buying individual parts is better, And thanks.

Update 1 : Ok thanks for all the tips and help and now my father is almost fully convinced thanks to all of you, i will update on the assembly process and if I need any help with assembly or troubleshooting, now I know where to ask :)

Update 2 : IM GETTING IT IN THE SUMMER LETS GOOOO