Is there a reason for the file size limit on imported Sketch files?

Recently, my group has wanted to import our fairly complex Sketch files into UXPin, but unfortunately we weren't able to due the file size restriction. 

Other tools like Figma and XD don't have this limitation, which is where my co-workers ended up importing them to. Not ideal to keep buy-in on using UXPin if you ask me. 

Really hoping this can be eliminated.