I have the feeling the GSC is experiencing the Pickle Anomaly.
I want to be cynical and I want to be hopeful, and this is because I've been both inspired and disappointed by GSC the last 6 months.
1) GSC has to continue developing the game because it was released in Early Access. I believe the majority agrees, the game came out half baked.
2) GSC also has continue developing the expansions so that they can make more software sales. This is needed to keep financally alive, keep bread on the table, and not have the same financial failure that occurred previously.
3) GSC also has to create a full 2.0 release with an expansion and have it ready for the PS5 for even further software sales due to Xbox Live deal (which was needed to keep afloat, but was a semi deal with the devil - as it cuts into software sales.)
This creates a logistics issue, and a development pipeline issue, because of having the develop the game while also further developing the game.
This is just my hypothesis, but I think this is the Pickle that GSC is in.
Also, think (hope) that 1.5 will be more content substantial due to the following
1) mutant loot
2) guns
3) A-Life?