Problems have been reported with apps as well as the lack of interest in TV manufacturers in ‘owning’ their software for more than a few short years.
‘Our’ typical advice on the Community is use a PC, tablet, phone, or other device/app (roku, apple TV, chromecast, etc, etc) because they have better support and upgrades.
It is unsurprisingly manufacturers focus on marketing, selling, and periodic obsolescence; and care less about owning and using.
Most relevant features can be gleaned from the online reports and using filters, excepting the messy issue of apps and manufacturers track records of software maintenance. 10% in the overall scores for smart functions is not much, but if the smart functions are dodgy? or the manufacturer has a poor track record? or the apps might stop working when the ‘app’ needs to but is not timely (or at all) upgraded?
Not much about reliability of apps and software maintenance in the buying guide either. The sole reference I found is check the settings to make sure your TV is set to download firmware updates automatically. If not, turn it on as this is an important security feature. It is often an app or operational problem not just security, and an important unaddressed question is even if it is turned on, is ‘anybody listening’ at the other end, and if so for how long? The 1-year warranty? And how well does that go against the routine updates required to maintain compatibility with the myriad providers?