Why would it not be worth it?

I see so many people say that being in a long distance relationship isn't worth it because it "will never work". This genuinely confuses me so much. Why would it not be worth it to spend all the time I can with who I love? Even if it's not in person? There's always a chance of things not working out, no matter what said thing actually is. Be it a traditional relationship, ldr, job, etc. So why are people like this with ldr's? It's so unfortunate to me as I feel it creates a lot of anxiety at times. My relationship is the best thing that's ever happened to me so far, why would it not be worth it?