I really don't understand the resistance to metering. I'm a professional audio engineer, and while it's true that you want to mix with your ears and not your eyes, meters serve several essential purposes.
One purpose is to make sure nothing's clipping, though as noted above that's really only a concern on the output. All the same, there have been times when something just sounds "off" and I'd really like to know with some certainty whether I'm clipping the input.
Another critical purpose is to normalize levels. When I'm building a patch, I don't want to have to constantly flip back and forth with my other presets in order to check the levels. I want to focus on building the patch. Having in/out meters would let me build the patch to a certain output level, and be reasonable assured that it's not going to be horribly mismatched with my other patches.
Sure, if you're comparing the Helix to analog pedals and amps, you're right that few of those devices have metering. But those devices also don't have recallable scenes, each containing dozens of different gain and level parameters. Any audio processor with detailed presets, a mic input, or interface abilities needs metering, and the Helix has all of those things.