As long as it doesn’t get its glacis add-on armor module, Leopard 2 PSO is just a Leopard 2A5 with 1 less HP/T, and therefore, worse mobility.
I would hardly consider better CE/autocanon protection enough of an “improvement” to offset the worse mobility to the point of considering it an upgrade compared to 2A5 and even 2A6. If anything, it’s a sidegrade.
As of now, I don’t think it’s an interesting enough vehicle to be willing to go through a 481,000 RP spading process. It’s not even the upgrade Germany has been waiting for years, as I said earlier, sidegrade at best.
TLDR: on its current state, it belongs in a folder with 2A5, not at the end of the line.