My tandem (new Oct 20) has 46/30 on the front, and I believe 11-34 11speed on the rear.
Mechs cope perfectly well, using a double on the front is a lot easier than a triple, and I'm surprised how much we can use the 30, on the smaller cogs at the rear, we can spin quite nicely up to 14/15mph.
On my road bike, riding a triple over 20 years, I simply used the 30 for hills, and then on the largest 2 sprockets of the cassette. So effectively there was significant redundancy in the gear combinations.And when in the 50t ring, I never used the two largest sprockets. So 3*11 = 33 gears less 9
unused ratios less another 2 unused ratios = 22 ratios used on my triple. Hence my de-tripling, and moving back to doubles.
Another factor is the advent of the 11tooth sprocket which has made chainwheels over 50t redundant for me, in fact, I'm happy with a 46 - it's a 113 inch gear.
Versus your existing setup, I think you will be very pleased with the performance of a compact double and 11 speed cassette. I cannot comment on durability, but I'm always pleased to wear something out, makes me feel like I've been riding enough!