Caring about valve as a developer of games is kind of futile, they already struggle to support the games they have out that aren't dota2.
CSGO gets updates but it's usually a horrible update that gets fixed later the same week because of massive community backlash. Hell the updates themselves are getting even more scarce, last year we only had 1 operation.
The guy really makes it sound like the only way to get things done at valve is to find a project a lot of people are already attached to. That kind of mentality is what has lead us to a position where there are disproportionate amounts of people on one project than another.
Valves interest in monetizing almost everything is also absolutely frustrating, valve would rather protect their in game economy of weapon skins and hats than allow people to open up the boxes that drop for free. Multiple solutions have been proposed to them too, like if you open a box without a key then you're never allowed to trade or sell the item, but they don't care because it would lead to diminished value on items in their eyes which means they'd be making less profit from skins.
DOTA2 officially released in 2013 and since then they've put out:
Steam machines
Steam OS
Steam Link
Steam controller
The VIVE
The Lab
Steam machines have basically been ignored completely
Steam OS is kind of useless to most people
Steam Link is a very niche product that ultimately ended up gaining more traction than the steam machines.
The steam controller seems to be doing ridiculously well which is awesome, i personally don't really like the controller but I'm happy that there is finally a "PC controller" that works seamlessly with most of the games on steam.
The VIVE is doing well on the VR spectrum I believe and it's really cool hardware that valve is probably actually going to carefully nurture. The lab is a super cool demo that takes advantage of their new hardware.
Honestly I don't think it's likely we'll see anything game related from valve that isn't going to be VR first for a long time.
If we ever see HL3 or anything related to half life, it's likely going to have some VR component built into it.
I guess if I wanted to look at it from a positive light then I would say "valve wants to make sure their games have the longest legs possible and won't develop sequels for them until the game are just absolutely beyond updating when it comes to deploying overhauls for them" and I honestly kind of really believe that. They like to make sure their games can run on the widest possible range of machines. That's their method of promoting accessibility.