And from my understanding on printers, a lot of them especially printers dedicatedly designed for photo printing are adapting the AdobeRGB color space, because of the richer tones gained from it. And yes you are kind of right, the an average printer might not have this support, but more printers used in print labs will. Printing in sRGB is the safest way, if your workflow involves more web usage but if the workflow involves more of print work then I strongly suggest Adobe RGB at least. The blog is based on my personal experience and knowledge about the print.
Abhishek,
Even the points I mention in my comments are with my personal experience. There are very few commercial printers, very few that can really handle Adobe RGB and no printer that can handle ProPhoto RGB. Both these color space are working color space.
Most of the guys working with commercial printer may claim that they can print in Adobes sRGB, in reality they convert them to sRGB before they send it to the printer. The client doesn't even know this. I went through this experience when I found the print colors were different than what I saw on the monitor. By the way, I work with a pro monitor which is color calibrated every month.
The normal computer monitors that we use at homes cannot even display 100% sRGB, therefore printing in Adobe sRGB is very rare and that too on a printing paper which can print truly Adobe sRGB space.
My workflow in Lightroom and Photoshop is to proof the file to sRGB before converting then to TIFF or best JPEG for printing. I try to get the printer profiles and install them in my computer. I have also realized the printer does not even handle 16 bit TIFF.
These are my views from my experience. The last 24 x 30 inches prints I printed were one year ago. I am not sure if the printer technology has changed. I am referring to best printing labs in Dubai and Abu Dhabi.
Henry