How is what we see a step forward from what already exists?
I assume you mean the OGL1.0a compared to this 1.2. Clearly 1.2 is an improvement on 1.1.
So compared to 1.0a What has improved for users of the OGL.
It patches the hole in OGL 1.0a about not being irrevocable.
It's now right there in section 2. They cannot modify it except in the part about who you attribute and who you notify (I assume in case those details change). They can only terminate if you breach it (7b), or if the license if found not to be enforceable (9d).
The CC BY 4, license itself is irrevocable, so the stuff they put in there can't be touched. That's an improvement even if you don't go with the OGL.
I mean it still has some issues but that patches the hole in OGL1.0a about "irrevocable".
You don't have to include a copy of the OGL (section 10 on 1.0) in your published document, just putting the badge on is enough (5a in 1.2). Which is going to save a on paper if you do print runs of your book.
So there's that, I mean really not much is an improvement on OGL1.0a for publishers, but if that is going away this one isn't remotely as onerous as the 1.1 leak we saw.
However I think you should be concerned if you are in the VTT game or someone that uses an existing VTT. The clause in the Virtual Tabletop Policy of VTT to only "replicate the experience of sitting around the table playing D&D with your friends" is worrisome.
It will stifle development, as additional features might not fall into this remit, second a lot of the features existing VTT have already breach this. Dynamic lighting isn't something you get in normal play, you might be able to claim fog of war is okay as the GM reveals the map as you go. Roll20 can already do animated spell effects and that is clearly called out as something that isn't allowed. Are they going to have to remove features to become compliant? You can bet if so those are features D&DBeyond's own VTT will have (when it appears).
Seems to me the leaked OGL was written by lawyers and execs that wanted all the pie. This second one has realised how much ill will that has caused for so little gain, but they still want to get control over VTT for their plans for monetization.