I agree with you. It is a ridiculous cycle of broken, year later fixed, broken, year later fixed.
The reality is that they put out each year new features due to users demands for those that "want now and can't wait". These people are the ones who drive their business.
This is the younger (millennials) crowd who usually spend and buy more frequently then others (as the guy who said "kid who lives in the basement" comment tried to express. LOL, but understand why someone might be offended - both come from the other side of the cube on their view points and should be able to express them without all of the flack. Of course, a wise crack comment - though possibly true...probably deserves some flack

(joking, come on people - lighten up).
Anyway, That is Apple's target market currently and why we see what we see.
Nothing wrong with this of course though I too disagree being one who desires a stable OS X over all the fluff, bells and whistles approach. If enough people desire a more stable and less frequent OS X release, then Apple will comply, but it is difficult because people keep buying, this includes iOS as well. Remember that Apple is a business to make money and not to save humanity as some would like for them to do or think that this is what they do. If they make their money on those that demand "new" "new" "new", why would they not in their mind, given Apples current philosophy of life?
Demand is what motivates them. Stats show that the younger crowd spends and is who buys the most Apple stuff, so why cater to those who want a stable OS X and will use it for a few years (or more) and not buy anything for a few years..?
But...I see that Apple still has some ethics in their OS X cycles, that is why the continue to stabilize the previous OS X. First to cater to those who want "new and latest" and buy when the latest new thing comes out, then stabilized the last version for those who will buy in the future and who will use/keep it so they can make some money to buy later (or give money to their kids who will continue to buy, buy, buy in the yearly cycle. Keeps the machine going.
Or..maybe the reason why they work on stabilizing their previous OS X when another comes out is because in-house they HAVE too use a stable reliable OS X. Would you want them to convert all of their in-house systems to a new buggy OS X each year and have all of your apps, iCloud, mail, etc. constantly be vulnerable to bugs and break? I for one do not want Apple to update their in-house systems every year to the "latest and greatest" and have the possibility of my data and iCloud stuff getting messed up.