There's more to it than LTPT deferrals. There are other administratively burdensome provisions, like requiring Roth catch-up contributions and mandatory automatic enrollment. Additionally, if SECURE 2.0 goes away, 403(b) sponsors don't have to worry about any LTPT rules, not just an alteration of who counts as an LTPT employee, which impacts things like vesting.
Also, I could see someone who is facing a very expensive audit cap related to a botched mandatory automatic enrollment using the threat of a lawsuit as leverage when negotiating with the IRS. A medium sized employer could find itself in a situation where the combined cost of correcting MDOs, paying lost earnings, and the fine could exceed the cost of the lawsuit. If multiple employers all facing similar situations were to band together, the cost of the lawsuit could easily be far less than the cost of complying with SECURE 2.0.