CSGO has had a lot of work put into it. It's a very different game than when I started playing it (over 10 years ago). I remember it wasn't even developed by Va

CSGO has had a lot of work put into it. It's a very different game than when I started playing it (over 10 years ago). I remember it wasn't even developed by Valve, originally. It was developed by Hidden Path Entertainment. For a long time after it was released, CS 1.6 and Source were still more popular than it. None of the maps in the current Active Duty pool were included in the initial CSGO release. They've either been re-made from scratch or are entirely new. Every weapon other than maybe the knife has undergone balancing changes in terms of cost, reload speed, movement speed, accuracy, etc. Various new weapons have been added to the game. New game modes have been added, including Danger Zone, which is pretty much an entire game of itself. Battle passes have been introduced. Skins implemented. Etc., etc. - and 1.6 and Source are all but forgotten. I think this is actually the key to understanding the significance of CS2. It looks very similar to CSGO. But, in 10 years time, I suspect many major changes will have been made that will distinguish it very much from CSGO, updates that would have been impossible if they'd stuck with the source engine.