Maybe it would've been worth splitting the strategy - Leclerc on the (used) Mediums and Sainz on Fresh Hards. That way, if the Mediums ended up going off a cliff, Sainz might've been able to act as a rear-gunner for Charles... but they didn't need to worry about it anyway with George falling back.
At least then they cover both bases... and at least one way was going to work out better.
I'm still in the camp of believing the Mediums would've been the better choice; The team did over 30 laps with them on both cars, on high fuel, with the track continually getting rubbered in and both drivers right before the stops were still happy with the degradation. The fact Lewis made it work and set the fastest lap at the end shows they still had plenty of life left in them, and I don't think the degradation on the Ferrari was any worse than it was on the Mercedes (at least in Charles' case). If anything, might've been the other way around...
Either-way, nice haul of points... chase is still on for P2 in the Constructors.