I hate throwing things away. I have that weird propensity to hoard. Thankfully, we have very little space in which to do so. I think it's a gene that came from my father. He had to buy a shed on adjoining property just to store old Volkswagon parts, an extra pickup camper, and more tools than any person would use.Even when things come to the end of their useful life, I spend time imagining how they can be re-used. I'm pretty proud that my old Nexus 5 can live on, even without a telco SIM inside.
My old phone has now become a type of entertainment remote for our old Google Chromecast. We have an Android TV box that works perfectly. However, booting it up just to play a bit of radio or listen to a few minutes of music seems like a lot of effort. Now I can flip on the TV and HTS and make more use of the Chromecast. I think it does provide better-quality, video streaming than the HDMI out of my TV box.
As an added bonus, I can use my Nexus 5 as an MP3 player for my walks. Not being an earbuds-kind-of-guy, I can slip on my large, over-the-ear, Sony headphones. I let Google Music copy about 5GB of music to my former phone. That app can be switched over to 'downloads only' when I go outside. It will still stay up-to-date with new downloads and my thumbs up or down data when it's connected to WiFi inside.
I feel better not tossing the rather ancient phone. It has now been repurposed strictly for audio and video apps.