1) Their reputation really has been damaged over no HL3/Dota 2 money grabs.
2) That they can't just publish anything onto Steam anymore with little to no upfront communication.
3) Not all monetisation models are viable - especially with the recent loot-box fiascos. If they wanted a card economy the game should've been free with random cards, with the option to purchase cards to have your own collection.
The past few months they've definitely started to change over the response to Artifact. Dota Underlords was shipped in only 5 months, so it just shows what they're capable of with a little pressure.
They did extensively test Artifact but user testing will get you stuck in local maxima. You still need someone with a good wholistic vision to make a great product.
Holistic?
https://www.npr.org/sections/thetwo-way/2015/06/01/411231029...
Valve also has a unique decentralized structure where teams work independently on games, as has been noted many times before with their handbook (not sure how accurate that is today). So it's possible you're just seeing the results of a completely different team.