It is possible to call in and get voicemails with GV but... why?
I haven't relied on voicemail for years. If someone doesn't get through to me, they tend to email or text me instead.
I use GV, and I actually uninstalled the Sprint VVM app completely. No point in running an app I will never use. I think it's completely fine for all texting and voicemail usage. I will lose the ability to access GV via the app when in bad service areas, but those instances are rare for me. Losing data is usually analogous to using voice connection as well, as a result it doesn't make much of a difference.
However, I digress. Having GV text you each time you get a VM means you will get double notifications during the times you have good data connections. The GV app will notify you, and then you will also get a text.
You can choose to NOT use the GV app and only receive text, but then you cannot play the message. This wouldn't work for me because 80% of my voicemails is when my mother leaves a message for me in a foriegn language.