You'll be able to successfully push the images without it. Tags you pushed won't properly show up in docker hub and clients will have issues pulling not just th

You'll be able to successfully push the images without it. Tags you pushed won't properly show up in docker hub and clients will have issues pulling not just the tags but the layers. It's been a hot minute since I hit that issue, but I kind of doubt docker hub fixed it. I suspect fixing issues around OCI format images are fairly low priority for them.