They have to be disposed of. That creates waste. This is the same as with any other power generation method that exceeds it's lifespan. 15 years is not that different from 20 years for a wind turbine or 30 years for a solar panel.

Solar panels are lasting about 10-15 years in practice. About half of what was expected.

I call BS on that. This was the performance of ancient modules (early 1980s) after 25 years of operation: https://energiforskmedia.blob.core.windows.net/media/19320/p...

And this was for modules manufactured in a period with 5-10 year warranties for the product. Today you get 25 year warranties. So you're basically claiming that QA massively worsened in the meantime.