no, takeout gives you the full quality. All other ways of accessing your photos from the api (there is some github projects) don't give you the full quality images though.

But with takeout the problem is that all dates and metadata gets messed up. I had to learn this the hard way. There is some tools that somehow correct the dates. But it's not perfect and I wouldn't really want my photos to be locked up like that. What if google decides to discontinue Google Takeout? Or just give you lower quality pictures after some point? You really are not safe.

Since that experience I moved to onedrive temporarily because it's a bit safer solution for now until all of these new services get stable (immich, ente, etc). Onedrive let's you access you photos like normal Onedrive files so that's really good. I know microsoft will have my data now and sync is also not perfect. So it's definitely not perfect. But I had to move to something else before the better solutions emerge.