Rules like this are woefully incomplete. Complications arise in individual circumstances, vagaries of the market beyond anyone's control and any number of other things.
For what it is worth, the article says that a 45 year old should have 3.6 times his salary saved, a 55 year old should have 5.4 times and when you retire you should have 7.7 times your annual salary.

If you still work what are your biggest expenditures? If you are retired what are your biggest expenditures? What are the likeliest changes to expenses between working and retiring? Our biggest expenses are estimated tax payments and savings. If I ever stop working and start living off of savings then I would think tax payments would go down and savings would mean taking less out of the portfolio one quarter.
If your biggest expense is your mortgage do you plan to have that paid off when you are retired? Many people say yes but some say no. Do you have car payments and credit card debt? Do you plan to eliminate that debt when you retire? If you answer that question with a yes, then you must ask yourself whether you really are capable of eliminating that debt (ouch).
Most people probably assume healthcare expenses will go up in retirement and in general at a rate faster than inflation. That is a good assumption but I don't think there is a realistic way to figure out how much healthcare expenses will go up and it is difficult for several reasons to know what, if anything, you will need.
Another ouch is about disciplined spending habits. Anecdotally, living beyond ones means is a big problem and many people living beyond their means are either in denial about it or don't understand how the numbers work. I'm telling you this afflicts a lot of people.
This might be a good spot to bring up one of my favorites, the one-offs. Some people never have to deal with anything major while others may be very unlucky. Envision a scenario where a year starts out with an expensive trip of a lifetime (we all need to have fun) followed by needing a new roof, then a deadbeat adult child (sorry but they're out there) hits you up, then the car needs a new Johnson rod (Seinfeld reference) all coming in a year that the portfolio turns out to drop by 20%. That combo may not be a deathblow but it would surely cause some sleepless nights. Now how much planning can you do for that?
This is not a knock on financial plans at all. A good plan will give a couple of assumptions for portfolio growth and they allow for telling you when you are getting too far off track--very important stuff. But over-reliance such that the forest gets missed while looking at tree and betting your financial future on overly simplistic rules of thumb is a rotten idea.
No matter how much planning, saving and investing you do you will have what you will have and it will either be enough or it will not. If not then something has to give. Period. The roughness of this road can be mitigated by saving a lot, living below your means (this concept is totally ignored in the article) and doing something that produces enough of an income when your are older such that some of the burden is taken off of your portfolio.
In the past I've posted a few ideas about working or otherwise generating income as part of a post-career life and a couple of new ideas came to me yesterday. Bud Selig turned 75 yesterday and obviously still works the the commissioner of Major League Baseball. Being the commissioner of a professional sports league pays millions. Selig has had that job since he was 64 (in an official capacity). This would be one place to look for work and I'm sure most sports fans would enjoy being the commissioner of a professional sports league.
The other idea I had is inspired from the baseball card above of former Red Sox backup catcher Bob Montgomery. Bob is 65 and while not the Sox' regular announcer does do some other broadcasting work. Being an analyst or play by play announcer can be quite lucrative, admittedly these jobs pay less than being the commissioner but low six figures announcing games for part of the year could be a huge helper for relieving the burden off of your portfolio.
Ahem.
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