I agree, having a lot of “Pasted” filenames isn’t very handy when attempting to link manually, or find images in the filesystem later.
It would also be nice if you could simply rename the attachments directly from Obsidian, updating the filename, as well as any links.
Edit, I am going to merge these threads, since the feature request is very similar. I suggest adding your vote/discussion to existing threads when possible, rather than starting a new one.