Reviews are the lifeblood of all authors, not just Indie authors. With fifty plus reviews, Amazon increases its promotion of your book. So if you even just leave a one sentence review for a favorite author, you are helping make the book more visible to others.
The but is that Amazon can be suspicious of reviews left not only by family members but also by authors and editors and suspects a tie-in somewhere.
So R must also be for Reader. Always with every book you produce, ask yourself honestly Who will read this? Why do I write?
If it’s just for your own satisfaction, that’s fine. But if you want to be read, you need to ask what the readers of your genre are looking for.