Are fractional shares worth it?

As an investor considering diversifying my portfolio, I'm curious about the merits of fractional shares. Are they truly worth investing in, or are they simply a novelty that doesn't offer significant benefits? Are there any potential drawbacks to owning fractional shares that I should be aware of? Additionally, how do fractional shares compare to traditional full-share investments in terms of risk, return, and overall financial impact? Lastly, how do I go about purchasing fractional shares and what platforms offer this service?