TBF, while thinking the Steam CCU for the game might be higher than on the PS5, ultimately I am happy the game is doing very well in general.
That said, you do have to consider the following..
1: There are 130+ million Steam users, vs. ~ 53-54 million PS5 owners. That it's ~ 50:50 between both platforms (or only slightly higher for Steam) shows there's a much stronger attach rate on PlayStation
2: Most of the game's sales and growth has been through WOM, and the very transparent providence of Steam player metrics alongside the relative openness of PC as a platform, have given that platform the edge in driving a lot of that growth.
If there are any immediate lessons for SIE to take from here, it's to:
1: Make online game metrics (CCU, total player counts, peak hours for play, etc.) much more transparent for PlayStation owners, and
2: Make PlayStation consoles more desirable for dual gaming & streaming setups
Meanwhile the PS5 Pro can help with things like framerate boosts, or maybe Sony could make a monitor with some type of processing that handles frame generation from a signal input. Shooters like Helldivers 2 benefit a lot from high framerates and that's something which attracts streamers and competitive players to platforms like PC.
All of this ties in with the increasingly reality that, for Sony, while growth on PC is nice, ultimately without a storefront/launcher of their own, PC IS a competitive platform to PlayStation, and they should start looking at what aspects of it can be pillaged and improved upon for inclusion in the PlayStation console platform.
And I know what
@KnittedKnight is saying and, yes, I am one of the ones who's said that Day 1 GaaS is "fine". But in hindsight, it wouldn't hurt for SIE to implement some of the improvements on the PlayStation side suggested above, that way it's harder for people to simply pick PC over PlayStation even if the Day 1 choice for GaaS is available to both. Additionally, I still would say only some GaaS need to be Day 1; others should prioritize console.
Or, if not, then Sony need to provide free perks and benefits to people buying the game on the console; I don't doubt free online is yet another reason Helldivers 2 is doing so well on PC, potentially even more than on PlayStation consoles itself.