Remaster was to convert Paizo's 2E line from OGL to ORC, not to update the ruleset.
OGL classes needed updates because it was illegal for 3rd party publishers to mix ORC and OGL content in the same book. For example, it remains illegal to include Kineticist content in an ORC book. Starfinder 2E is already ORC, so there is no legal incentive to do so. As the OGL event was a one-off event that cannot be repeated, especially as Paizo basically owns ORC, and cannot really have a fiasco to separate from their own license (At least not without a very convoluted turn of events).
As for the larger scale remaster changes in Player Cores 1 and 2, those were more a matter of convenience. They were ideas that would have gone into Pathfinder 2E's upcoming equivalent to Pathfinder Unchained, brought forward early for the license change. But beyond that, any change to post Remaster books would be on the level you'd see for books like Dark Archive, Guns and Gears, and Treasure Vault; just errata passes. That's the extent we'll be seeing in Starfinder. The closest thing Starfinder 2E would get to a remaster under these conditions is its equivalent to Pathfinder Unchained or Starfinder Enhanced. While I haven't read Starfinder Enhanced yet, I can speak for Pathfinder Unchained that those are suggested rule changes, but not a comprehensive remaster.
Basically, if the OGL event never happened, there never would have been a remaster. Books would have been updated as normal errata, and many of the changes in the remaster would have only been introduced by the Pathfinder Unchained equivalent as optional rule, not as a rule change. It was a matter of convenience for the license change to include rules updates while the effort was there, but not Paizo's standard operating procedure. The remaster was also disruptive to the order of release, as many books were pushed back to make room for development of Remaster books. The remaster was a mandatory thing, but it won't be done again where it is not forced to be done again. (Plus, as someone who predicted the remaster for Dark Archive and Secrets of Magic day 1, the thing to note is that most people didn't predict it because they didn't want that prediction to be true. They didn't want a remaster project because that was less new books. They were not really predicting, they were really just phrasing wishful thinking against the disruption of their book lineup as a prediction. The lack of a comprehensive remaster only affected businesses, not players, so player's didn't care about those matters. Most of us who were paying attention to the legal side of the fiasco knew this had to be done, because the implications of not doing it were gonna cause a lot of problems down the line. Paizo also could not say much on which books would be remastered when, because the audience was not allowed to know when a book's replacement was coming out, else they'd more easily strategize not buying certain books if they knew its replacement was coming soon, decreasing the chance of selling those books. It was never about improving the game, it was about licensing rights. Though improving the system did work to make rebuying your books in the new license more palatable I suppose. But Starfinder 2E is already in the new license, unless Paizo wants to make a new new license. I'm sure the devs and the lawyers would love that.)
