Agreed, but it's mostly about convenience. Many people pay MORE for convenience. That's basically modern society.

But even if it's cheaper, if it's even slightly difficult to use, adoption will be very limited.

I'm among the most tech savvy people I know personally. I've tried lightning many times in the last couple years, and I kept giving up on it. Not until the last few months has it become easy enough to use. And I've never used Bitcoin to pay for something besides filling my lightning wallet.