Raster on top of vector. Does everything turn to raster when exported?

Hello! I'm in the process of learning "surface pattern designing". I started with Illustrator which is great, but I wanted to add texture and all that cute stuff in my artwork. I then learned Procreate which I also enjoy very much. But, because Fresco has the option for both vector & raster, I'm leaning towards creating more with Fresco. Especially since it's easier to transfer artwork to Illustrator. However, because I mix vector and raster together in Fresco, it seems as though everything turns into raster when I export to Illustrator - which defeats the purpose of using vector. I've always preferred vector because of the resizing benefits.

My question... should I even bother with using vectors? Should I just size up really big so that sizing won't be such an issue?

Also, I could be wrong. Maybe? If the vectors stay as is and only the rasters change when I resize, then I could just keep creating my work in smaller file size and I don't really need to bother with create large sizes for the sake of storage space.