I agree with everything everyone has said thus far, but I think a few practical points need to be put forth. First, if a plan is a start-up post Secure 2.0 signing, then whoever is the recordkeeper should "strongly encourage" the employer to implement the ACA provisions from day 1. In our case, virtually all did. Second, it is actually highly unlikely that a post effective date start-up has actually decided to move recordkeepers. In most case (not all, but most), there aren't sufficient assets to entice a successor recordkeeper to seek out that business, nor are salespeople interested because the payout is low. If a salesperson is going after start-ups or newer plans, it's because of a relationship with the advisor (and of course, they are the most important advisor on the planet gobs of new business if we do this one favor for them....) Indeed, many recordkeepers loathe startups to begin with (the payback is lengthy) end have back end "term fees" that discourage moving the plan early. There are some that move, and it is incumbent on our transition services team to verify status, and our document consulting team to engage the client to implement ACA at transition time, rather than 1/1/25.
Our approach, is to accept startups, or many newer plans ONLY IF they implement ACA provisions to kick start asset growth (oh, and it's good for the client too.)