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Pretty much all of that, with a tangent about the Gibson engine; it's its reliability and price that keep it around, its in/efficiency is essentially a moot point.
Stint length has been used as a form of balancing for a while; in the LMP1 heydays there were more than a few arguments about EoT and how it impacted the [diesel] Audis. A certain few posters would spend hours here debating the K-factor (used to equalise calorific fuel values) and tank sizes of the prototypes.
As long as the ACO are wedded to a 3:30 lap time, LMP2 in its current form requires significant pace reduction to keep them separate from LMH across a race distance. From teams and drivers' feedback, we're reaching the limit of what can be done in terms of pure pace (power, weight, aero, tyres) before it drastically alters the way the cars run. Mandating a maximum stint length via fuel tank size is just another tool in the arsenal, albeit it may have unintended consequences for the pit crews.
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