I is a lot more complicated than that.
There is a trade off between data per flight, total timeline, and overall cost.
I dont think data per flight is the driving goal. There are lots of unknown, and if you stop completely for every problem, you are aren't learning about new problems.
As long as they get the ship up and make some progress, it isnt critical if these boosters blow up or sink the bottom of the ocean as planned
They have 4 boosters built and 3 more in production, and FAA license for 20 launches per year. My guess is that if the fix takes substantial time, they will work it into future production and keep going with what they have.