Do you download the files directly to the HDD or transfer them over from your machine? Do you keep the drive running plugged into the Shield all day?
I have a Shield in my bedroom too, I vouch for it 100%.
My family room TV has Android TV also so I probably could try that and set up and see if it would work.
Was looking up cheap miniPCs and so many looked shady with spyware or malware pre-installed
I download the files on my main pc, put them on my hdd, then connect it to my shield. I don't keep the hdd on my shield all day.
If you're looking to download files directly on a HTPC, maybe that's the way to go.
Honestly, I just find my site, download that shyt onto my HDD, and then plug it into my Shield.
A HTPC is cool though. You could probably just build one. Size is a matter though. You gotta fit it in. I have a music server (24tb of ssd) and it's fukking amazing (it was expensive though....$15k). The convenience factor is big. I could not do without my dedicated music server. I stream it all over my house. It's amazing.
Honestly, you're probably downloading 15-60gb for a 4k movie. The hdd is too slow. You just download it on your ssd, use winrar or whatever, let it uncompress and then put it on your hdd. Decompressing files on a hdd is a bad look. Just download that shyt on your pc, spend like 5 minutes transferring it to your portable hdd, plug it into the Shield and be good.
People have servers for this though, but I don't like the buffering you get with wifi. I just want it direct.
You might be able to plug that shyt directly into your Android TV, but TVs sometimes have limits to the file size. Like my old LG Oled, I could only play files that were less than 5gb. That's not gonna work for UHD blu-ray rips.
Really, I'd just buy another Shield Pro and call it a day. You're probably gonna have to use Kodi on a server anyway. Just make sure you never download DV, only download DV HDR or HDR.