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I bought it as a collectors item due to one that only really works on my carrier being Verizon is basically a cloneware model. And I wanted to experience Kitkat as I already have some familiarity with Lollipop on the S4 being basically the same as the S5 and having used 6.0.1 from September 2016 which was when I bought the phone till it started having green screen issues after Verizon pushed out a final update to patch the Blueborne issue in early 2018.If you downgrade to 4.4 doesn't that remove VoLTE capability? IIRC they added Advanced Calling in either 5.1 or 6.0.1?
That said even if yours has 6.x you won't notice any real UI redesigns other than the icons of some system apps. The overall UI of the S5 was always flat.
I upgraded to a Note 9 after multiple repair attempts by Samsung failed to cure the screen flickering issue. The 2nd and final attempt which was fixed under their extended warranty after I sent in the phone the first time they replaced the entire display and ribbon cable. Also I noticed on Kitkat the US models have some system apps that are white like on the Note 4 and not dark like on the G900F like dialer and contacts, music player app and Soundalive, Messages app and the video player app.The only differences I'd notice on Kitkat would be the dialog has the Holo-white buttons instead of coloured text, there's no FAB in any of the Phone, Contacts or Messages apps, and Peel Remote app has the skeuo UI from Jelly Bean (and won't work without updating to the modern version anyway), and the icons don't have frames.
Back when the S5 was new, this was when Samsung didn't change TouchWiz much across Android versions. I wish they kept that up myself. I don't adjust well to even the most minor change. I'm still upset they removed the splash screen and various whimsical animations from Samsung Health in Android 12. If you try sideloading the older version, it forces an update shortly after. Keeping it offline via NetGuard just breaks the whole Together feature.
I am currently using an A14 5G, hoping that having 5G will get me more than a decade before that network shuts down (I'm sure network shutdowns are always going to be a thing now) and that means I finally have a phone I can keep for some time, but sadly it's an adjustment since modern Samsungs truly don't appeal to me at all, and it takes a ton of effort to "touchwiz-ify" One UI enough to safisfy me. Mainly getting rid of TONS of unnecessary notifications, many which don't allow you to turn them off, that are added to a modern device, and requiring third-party apps like BuzzKill to do the job. Three weeks later and I'm still struggling navigating the blasted thing.