it's not a definitive answer lmp, but the devil's advocate in me say that new cars are:
a) often easier to drive or simpler to run - especially ones built with customers in mind
b) easier to source maintenance, support and spares for
The existing ALMS teams are hardly enough to warrant manufacturers building bespoke cars for, but if new entrants brought new cars and grandfathered ones were matched on pace, the benefits in upgrading older machinery can still be found in the above.
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