I have a Philips 50pfl5604 that I purchased last spring. It is still android 9 and says no updates are available. Slow as !!!! My sister and B.I.L. each have a MeCool with android 11 and the difference is amazing. My question is can I force an android update with a thumb drive or connect a box like they have to my TV? I'm feeling stuck in the dark ages.
Nothing is wrong with Android 9, it works extremely well for streaming, you not missing out because you don't have Android 11 on your TV. Even have an Android 7 STB & Android 7 Stick device that both run extremely well. Just go over to the Nvidia ShieldTV subreddit and look at all the complaints from users letting there system upgrade from AndroidTV 9 to AndroidTV 11.
Software Development takes time & money and most manufacturers aren't willing to invest in making the software the best it can be; kudos to Nvidia for trying though.
The problem is Philips like most TV manufacturers paired just the minimum required CPU+Ram+Storage (hardware) and didn't invest enough resources to optimize the software to the hardware. So, Yes - adding an external AndroidTV device is the recommended course of action.