From everything I've heard, Omicron is much less dangerous than Delta or previous strands. Also, I've read that the Spanish flu ended with a fourth variant that was much milder than previous variants.

Assuming natural immunity is better than vaccine, and this variant is very mild, this is probably the one you want to get. What if boosters are being pushed at the worst possible time? With boosters you're less likely to get Covid, and what we've seen is that vaccines have a relatively short period in which they are effective. If you skip this variant, couldn't you get affected by a much less mild variant once the resistance wears off?

What am I missing here?

That being said, you should probably listen to your local authorities / doctors which are currently advocating everyone get a booster.