For internal projects/webpages (similar to Google Data Studio as mentioned), where you would expect the user to only be using it on a desktop, having no mobile support is fine.
But for external projects/webpages in 2016, where atleast 1/3 of usage can come from mobile devices, having a lack of mobile support is a complete, 100% nonstarter. And there are plenty of competing React UI frameworks with mobile support already.