Agree, It's open source, and got better compression ratio, iirc.Maybe we should upload our plugins as .7z files for now. It's a little more cumbersome for users since they are forced to use 7zip but makes sure it works...
There are worse programs to handle archives than 7zip. But 7zip is not the only tool that can handle 7z archives... As example TotalCommander can handle 7z archives (without the need of 7zip at all) the same way as .rar, .zip,... It's browsable just like a folder. One can copy files out of and also into the archive as if it is a folder... Creating new 7z archives is possible easily,...since they are forced to use 7zip