PADI's recommended course hours for OW is 31.
Of course you are correct (I always assume that as you know the standards back & forth). But IMO there are "problems". First, "recommended" means you don't have to (as in PADI's "recommended 60' OW depth"--as in an old thread, when can you now go below 60' without taking AOW AND "with PADI's blessing"?).
Let me say that I have talked with several PADI shops regarding their OW courses and feel that none could do a better job with OW than our shop (though of course I'm biased).
I THINK the OP's question, along with the many other threads on this subject, has to do mainly with pool time.
If you count all time spent on everything (let's take the "2 weekend" course for example), maybe it approaches 31 hours (maybe).
But let's use our shop's course for data:
e learning: I admit I'm not familiar with it (some of our instructor think it's great, others think it sucks). So let's take the classroom version:
Academics: 3 hours on Sat. & Sun.--test included. = 6 hours.
Pool time: Approx. 4-5 hours each of the 2 days (closer to 4?). So the first weekend is about 14 hours.
OW checkout dives: Actual time including gearing up, down and the 4 dives over 2 days: Maybe 4 hours each day= 8 hours.
8+14=22
Now, re academics, you have to consider that with e learning this probably varies a lot per student. Also, you have to consider this is book work--needed and important of course, but not actual doing of dive skills.
Re OW checkouts: There is some new instruction here of course-- such as a new weight check, maybe using the SMB (as per new OW course), maybe dropping weights, and of course the basic use of compass. Also, dive planning, the mini dive, etc. But a majority of this time is spent swimming (surface or below) to a float (swimming/buoyancy already covered in the pool), and doing SOME of the 20 skills learned in the pool. So, a fair chunk of those 4 hours each checkout day is not instruction on new skills.
If you actually just count the training with equipment, the 20 skills, and how to dive with good buoyancy as training, the hours decrease a lot from the 22 I mentioned. I am of course, not a PADI basher, as PADI is all I really know, and it's done fine by me.
Others from the olden days may also chime in saying that many of those pool hours back then were overly vigorous, leading to only Olympic-ready people to get certified.
So, if we use the criteria above, yes I think the OW course has been way watered down (based on what I read here, having only been OW cert. since 2005).
As some have pointed out over time, a course with more than what PADI offers (like "back then") would cost so much than many would just say forget it.
There is also the old thread on what "mastering" skills means (won't get into that). I would imagine the courses decades ago spent some of the lengthy pool hours on really "mastering" skills.
From what I've read over the years, Jim L. does an outstanding course with a lot more hours and at a very reasonable price. Jim can comment on SEI and how widespread the agency is. If you are not close enough to Jim or another SEI instructor, you are very likely to take a course as described above.