Sure you'll see lots of calls to google voice but here is a plus. If you have a cellphone plan that charges you minutes, you can say but honey this saves me minutes on outgoing calls. You can set Do not Disturb on your google voice for incoming calls and texts and you wont get someone calling you at an inopportune time. My kid uses google voice on his Iphone and only burns less than 100 minutes a month. Hopefully he's not using it to call providers
I can explain google voice a lot easier to my SO than I ever could if she found a phone stashed in the garage. If you MUST have a hobby phone hiding a SIMM card is so much simpler. Besides unless she's tech savvy it wont occur to her to try it out in her phone. But she might. Just like WALDT we have preferred methods of maintaining the veil of secrecy.