My thoughts run along the lines that you don't want to change the interior right now, at a time when the plane has been deemed to be fully compliant by the FAA.
To change the interior now could result in months of paperwork to prove that the design changes meet all the criteria set forth by the FAA for this particular model over the last 34 years or so (seats can't block exit doors, weight distribution has to be appropriate - you name it.)
If the interior was going to be altered, the time to do that would have been during the heavy C-4 check, when the interior was completely removed from the fuselage in the first place.
Get certified, get flights going, get more planes in the air and in reserve - and then get to altering the interior.
JMHO.
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