Because you cannot earn passive income on Bitcoin

Perhaps at this stage, but the future will open opportunities we may not be able to conceive yet.

because it take forever to transact in a store

Do you think that this will be a permanent issue for Bitcoin in 5-10 years? The institutional money flowing in and government/corporate engagement doesn't seem to mind at this time. Tech is evolving and development will continue to improve.

because the last time alt coins outperformed Bitcoin (albeit with a delay)

I'm assuming that you mean outperformed in price? Fads come and go. Prices boom and bust. Most of that past performance was a new wave of crypto newbs buying up cheap coins because the blue chips "looked too expensive," or they maybe didn't grasp that Bitcoin could be bought in fractional amounts. Either way, it was a lot of dumb money pumping into alts last time, and this may happen again. I'd expect that money has gotten much smarter this time around, and there will be another alt season, but price is just a temporary thing and only valuable if you sell.

Or maybe I am just lazy ;-)

Hah. Well now's not the time to sit on your hands. In a few years, we may look back on these days and kick ourselves... Think about how lazy we can all be if we invest well now?

A lot of alts claim to be decentralized, but they're not. Bitcoin is. That's powerful and will probably be rather important down the line.

Thanks for the comment.