It definitely should reduce the chance of corruption, while as long as you ever have to write to the card you can’t be 100% sure. Having better SD cards and good quality power supply should also improve things in our experience! So far we have pretty good experience with resinOS 2.x in this regards.
Moving to the device that eMMC would be good too, indeed, though have to be mindful of the trade off taken. We are looking more and more at the Raspberry Pi Compute Module 3 (which also has eMMC), but there’s more work to do about that.