The new format will have the usual five sets reduced to three and Hewitt believes it was "ridiculous" to make so many changes to the sport's premier international tournament.
"He (Pique) knows nothing about tennis. It'd be like me asking to change things for the Champions League," Hewitt told reporters ahead of Australia's Davis Cup qualifier against Bosnia-Herzegovina.
"The two biggest points of difference were, one, the home and away aspect of it and, secondly, was the best of five sets. If you look at the pinnacle of our sport, which are the four majors, they're best of five sets."
Former world number one Hewitt is also not in favour of playing the entire tournament at a single venue, saying it was an idea that would not work in tennis.
"Having it at one place I think is ridiculous, I don't think many of the top players will play," he added. "They're basically running the ITF and a soccer league is the main sponsor of the Davis Cup."
Australia play their Davis Cup qualifier against Bosnia-Herzegovina in Adelaide on Friday and Saturday.
(Reporting by Rohith Nair in Bengaluru; Editing by Amlan Chakraborty)
