Double domes / intermediate gas

Hello to the gear experts, I’m dealing with the topic of intermediate gas and I really want to learn it. I found out that the technology goes as follows when switching down: 1.) Coupling step out 2.) Gang out 3.) Coupling come out 4.) Gas shock 5.) Coupling step in 6.) Gang in 7.) Put some gas on 8.) Coupling come What I don’t understand is what step 3 is necessary, or what exactly happens there? Wouldn’t it be enough to do the whole thing like this: 1.) Coupling step n 2.) Get out the gear 3.) Gas shock 4.) Get in the gear 5.) Let the clutch come What effect did the clutch bring? Who can explain it to me in an understandable way? Thanks already. LG Tigran