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So your problem is that during summer, average solar production is much higher than in winter in the first place. So to ensure that you have sufficient energy in winter, you can either overprovision heavily for summer use (lots of flat panels facing south) or you can sacrifice summer efficiency to gain winter efficiency - vertical panels do that.

It's not just about production, it's also about reducing maintenance costs (don't collect snow, less dust build up on panels) and land usage. If you can take that 77% average, but maybe stick a couple more panels on land to reach your energy goals in an overall smaller footprint with less maintenance work, then maybe it's a good solution to specific problems.

If you had a solar panel that produced half as much power as regular, but produced power at night that would be a massive win. This is a less extreme equivalent. It produces less power than a normal solar pannel, but it produces power at an important time (when regular solar panels don't produce much power).