Isn't that exactly what "Extended Distance Oracle RAC Clusters" provide?

No. That still uses ASM. It's effectively low level IO mirroring and needs fast data-centre interconnects and low-latency.

I work a lot with RAC and it introduces more problems than it solves tbh.

It's almost a meme. I was often told Companies RAC, experience RAC-caused outages, and then they de-RAC.