Originally Posted by statealum
-The dimming was introduced with the Dolby Vision firmware update that was released this year in late January. Some sets appear to be affected by the dimming more than others. More than likely any Sony A1E you buy won't have that firmware installed since it is a fairly recent update.
-You will be able to weigh the risks of installing the more recent updates to get Dolby Vision but also potentially have your tv start dimming or leaving the default firmware on the tv and being stuck with HDR 10 and HLG only.
-The upside of leaving your television on the default firmware is that you will never have to worry about your television dimming or game mode appearing too dark. The downside is you will not be able to experience Dolby Vision on this set and the Dolby Vision content I have watched looks very good.
-In my opinion the Sony A1E hdr game mode looks better than the 2017 LG. I think in order to reach 21ms the LG Oled cuts down on the processing more than the Sony does. Game mode on the Sony looks similar to it's cinema pro mode but there is also more lag 30-31 ms compared to the LG.
It's not quite that simple. Let's keep in mind that the latest firmware update also contain much more than just Dolby Vision. For example, here in Australia, the A1 has received the following set of features/bug fixes in the DV update (should be the same for most regions):
- Voice search UI has changed
- Improvement of Opera Apps performance
- Update of voice recognition language to integrate with TV language.
- Resolves an issue where Multiple Horizontal Lines/Bands appearing which is related to local dimming function
- Resolves an issue where short beeping sound can be heard after changing channel (PCM→Dolby digital (AC3) on STB)
- Resolves an issue where TV goes to 8X blinking when starting content from PS4 PRO
- Resolves an issue where Panel Refresh Pop Up is repeatedly displayed
- Resolves an issue where distorted audio is output through subwoofer after RC on from standby
- Resolves an issue where assistant (Voice) key does not work after Initial Setup
- Resolves an issue where HDMI no picture and no sound by OTP On
- Resolves an issue where TV does not change input of AMP(TV) when Source change to TV Tuner
- Resolves an issue where Video freeze and lipsync off on "Amazon Prime" playback
- Resolves an issue where Audio on TV Speaker echoes when Bluetooth headphone is connected
And the previous update (which is included in the latest firmware) fixed these issues:
- Improves TV response time when using the remote control
- Resolves YouTube 4K playback issue (2,560 x 1,440 resolution or higher)
- Resolves an issue where "No operation shutdown" dialog box cannot be closed when using the VOL+/- buttons
- Resolves an issue where the TV turns on by itself from standby mode
- Removal of Twitter functions (Social Viewing)
- Change of sound volume when playback AAC content for Shop front demo mode
- Change Idle TV standby to meet UAE Eco label regulation
- Performance improvement: slow volume bar, etc.
- Upgrade to Android Nougat
- Picture-in-picture during using an app
- Expanded support for Hybrid Log-Gamma HDR content
- Using voice search with the browser
* Internet connection is required.
- Voice search for Serial AbTak (Only in India)
- Improved the Settings screen
- Add multiple Google accounts to your TV
So if you stay on the default firmware, which can be up to a year old, you're going to miss out on some pretty important features like the upgrade to Android Nougat, improved navigation responsiveness, improved voice integration, and fixing critical bugs like the TV turning itself on or exhibiting audio and/or visual glitches.
Best advice would be to check your firmware version and if you're running the version just prior to the DV update (6.26 I believe), and you're not experiencing the bugs shown in the first list above, then sure, you can avoid updating the firmware.
For the record, I haven't seen the dimming bug in normal movie content, because movies (Blu-ray and Netflix) typically don't have any static components that display for a minute or more.