It's in there because PADI was the first agency to offer OW training that began with students in dive gear. This was a major marketing advantage and something they still push even though all the other for profit agencies eventually copied them. They made it a requirement to keep the instructors who thought it was a stupid idea in line.Here we go. I personally like to ease open water students to scuba by first getting them to do skin diving skills, so they first get accustomed to fins/finning, mask, snorkel, and equalizing. But per PADI standards, this can be done starting in CW2 or later. Not really subpar as suboptimal. The way to get around this is to give a "free" skin diving course after the swim/float tests. But to have to jump through any hoops is just silly.
I'd actually love for someone to explain to me logically why this limitation is in place.
Here's how PADI puts it: PADI Through the Decades: The 1980s
In 1981, PADI became the first scuba program to have new divers use scuba gear during their first confined water/pool dives. At the time it was considered bizarre to start divers with scuba rather than freediving. Now it has become an industry standard, and the “Dive Today” approach has continued to prove itself.