JoeBronco... Commercial breweries have super tight control over their beer from start to finish. Temperature control down to the degree F, the brews are typically fermented under CO2 pressures too. They also have perfect amount of yeast pitching for each and every brew. Can you do that at home?? Sure, if you want to spend the money to get all the hardware to do that. Most of us are not at that level (yet)...
Sure, you COULD get a beer from boil to bottle in under 2 weeks, provided you do many things perfectly. If you carbonate with CO2 (kegging) you can have beer ready to drink, once kegged, in just a few days.
Personally, I don't have a fermentation chamber (yet) so I'm at the mercy of the weather when it comes to what temperature the wort is fermenting at. So, some of the brews I've made needed longer to get rid of flavors I didn't care for. When I do get the chamber, my brews might be done sooner... Or I might just let them go for the 2-4 weeks anyway... Theres ZERO HARM in letting the wort sit on the yeast like this. Hell, there are more than a few people that have let the wort sit on yeast for 6 months, or longer, with zero ill effects...
Letting beer sit on the yeast for 2-4 weeks by no means makes us bad home brewers. It just means we're NOT RUSHING THINGS... I don't care if I'm grain to glass in 6-8 weeks for my normal brews. Bigger ones being longer. I'd rather BE PATIENT and let things go at their own pace.
My first two brews I racked to secondary, when I could have just left it on the yeast cake. I was going by the directions provided (before knowing better)... I still got good beer, but I can only imagine (now) how much better they could have been had I not followed the directions like that. I do plan on making one of them again, as an all grain brew, and let it do things at it's own pace.
Be patient with your brew, and the yeast... Give them the amount of time they need to make really great beer for you. NOT racking to secondary means you have less work to do, and will get a great brew. Racking to secondary opens you up to contamination (unless you live in a sanitized environment that is)... Sure, most of the time it won't be an issue, but you remember Murphy's Law right?
Brew as you like, racking as you like, but if you ask for advice on if/when to rack to secondary, the majority of people (now) will advise not doing it. Revvy has posted about this more times than you can count. He has the first hand experience (as many of us do now) with making really great brews by NOT racking to secondary just to clear up a brew.
Racking to secondary as a 'necessary' process is a carry over from a decade (or more) ago... Things have vastly improved since then, making it completely unnecessary for the reasons it was originally done. Sure, if you want to get the brew off of flavor elements (to stop their contribution) and add new ones, racking makes sense... If you want to age for a long time, and also add other elements, racking makes sense. Especially if you want to age in something like a corny keg (and fermented in a carboy/bucket)...
I don't live in a world where I can go grain to glass, properly carbonated, with a brew in 21 days... Even when I'm kegging, It will be a 2 week carbonation time frame (not going to rush carbonate) on CO2... Nothing I have made, so far or plan to in the future, is a low enough OG to be done fermenting in just a week (and ready for bottles)... Even if it was, I'd let it ride for longer to ensure that I'm getting the best possible brew I can...
I don't mind waiting for the brew to be ready... Maybe that's partially due to the fact that I'm also making mead, which takes MONTHS before it's bottled. Even then, it's typically a year, or longer, before it's actually ready for drinking... I also have a brew that was on the yeast for a solid month, and has been on oak chips for over a month. It's slated to be bottled before the weekend is out. Chances are, it will take another 3-4 weeks to carbonate (about 8% ABV) and even then, might not really be ready for drinking for another couple of months...
Using patience, you can make truly great beer at home... Just don't rush things, or think that every brew can go grain to glass in 21 days, like BMC does... Unless you want to make what BMC does, and have all the hardware to do it... Which, to me, seems rather foolish... Considering how every person, I know, that home brews wouldn't use BMC to pre-rinse their dishes...