It may possibly make things worse in a way, as any interruption in the internet connection could mean the VPN too needs to reconnect upon the internet connecting. Also it could mean more data consumption and even some other issues.

A wireless hotspot using the mobile phone network without a VPN would likely be more reliable for connectivity. But then those more portable ones usually have batteries that can drain down from use too, so leaving it plugged in for electrical charging may be necessary depending on how it is to be used.