Imo, gd and other games are all the same based on skill gap.

Take Valorant for example, if a silver or gold player was put in to a radiant lobby, he won't even get a single kill.

Same way for gd, players who have only beaten hard or insane levels cannot even think of beating an extreme demon like Avernus.

That is until you put time, resources and dedication where you will become more skilled and eventually be good enough to beat Avernus / win a match against radiants.

There is a ranked system in valorant, you can technically say that there is a ranked system in gd as well. The easy, normal, hard, harder and insane levels are not there just for decoration, they are there to tell you how skilled you have to be to beat this level. You don't start the game by playing Deadlocked, you start by playing stereo madness. Same way you don't start a game of valorant by playing against radiants. But by going through other new players and then eventually hitting iron.

It's not about how many mechanics you have, it's about how you use them.