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Mercedes was at the center of the controversy last year when it developed a wheel spacer design with holes for better airflow to better manage tire cooling.
Although the design was considered perfectly legal by the FIA, rival companies asked the governing body to know if it violated the rules prohibiting mobile aerodynamic devices.
To avoid any potential event during the F1 title battle, Mercedes chose not to execute the plans of several races before the confirmation of the championship.
However, with the concept given the go-ahead, Mercedes pursued this idea this year.
It is understood that Ferrari and McLaren have tested their own version this year as well, with other groups evaluating similar models.
Reflecting on the controversy, Nikolas Tombazis of the FIA, responsible for the technical issues relating to single-seaters, said he was aware that huge resources were being spent in the region.
But, he thinks that the ruling body would have been wrong to try to ban something that was in the rules.
S addressing Motorsport.com, Tombazis said: "The Mercedes solution was legal and the idea was taken over by others.
"But if you want my opinion, I tell you that these complicated designs are not good for F1 because they are expensive.
"When we appeared in October, we could not change things without a dictatorial act, because we found that they were following the rules.
"It does not surprise me that other teams come to enjoy the same concept."
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