Bad anology on the bicycle, DIY is nothing more than putting the proper part on yourself rather than packing the bike into the car and taking it to a shop. The bent coat hanger repair and the basic understanding of how things work could save that child if they were far off of the beaten path with no “proper” parts available. There was a time when the only way to get something was to make it yourself or adapt something not intended for diving for use in diving and sometimes it’s still the better way, I have a few pony bottles, on with a commercially available sling and the other with a sling a made from poly rope, I actually the rope one over the comerician one, they both work well but the home made one is more adjustable and compact.
Overall DIY is a good thing for some, maybe most, people.
Overall DIY is a good thing for some, maybe most, people.