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evolution does have big problems, at the cellular level as well as with the origin of life. There is so much stuff in the cellar machinery that is chicken and egg kind of stuff. You can't create RNA without a specific bit of cellular kit, but, you can't build that kit without the RNA in the first place, etc etc etc. There is a ton of stuff inside the very basic machinery of life(which is still massively complicated) that had to evolve spontaneously at the same time in one cell, from nothing but random soup of amino acids, fully functioning or you don't have something that is alive, something that can metabolize or replicate.

Abiogenesis and evolution are different topics.

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There is no evolutionary advantage to carrying around bits of stuff instead your cell that won't do anything functional until and unless you get some other completely preposterously advantageous mutation in the same once cell, or a million generations later.

If the extra bits don't create a disadvantage, they tend to live on anyway.

You and I and everyone else have dozens of genetic mutations that do not seem to have any impact on our ability to survive one way or the other. With every new generation comes dozens more mutations, and your mutations differ from those of your siblings. We also acquire more mutations during our lives. Mutations everywhere. Some cause cancer. Some may provide a slight advantage in ways we may not notice. Most are probably innocuous and aren't expressed in any way. But those mutations that don't kill us before we reproduce can live on, waiting for more and more mutations that might combine to create a true advantage.

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This is where evolutionary biology takes a massive cop out. It's basically at this point they say well we are here so we know it happened so, um, there. And they leave it at that. That's not science.