About 〜し、〜し、〜も pattern.

I’m learning this and it’s pretty easy to elaborate sentences with it.

From what I understand, it functions as たり to list certain things, BUT I have two questions.

1. What’s the difference between both?
2. Why do I always have to use the particle もinstead of が？

Examples:
この靴は、色も素敵だし、ちょうどいいし買います。
値段も安いし、デザインもいいし、故障も少ないですから。

Those are some examples from MNNII. If someone can explain why always も is used when using this pattern, I would appreciate it.