If the browser doesn't and the YouTube app doesn't, use your PC to run the browser and a Chromecast to view it on your TV. You don't need a very smart TV to work with a Chromecast, it only needs a HDMI input). Or use a Roku.

In fact, most "smart TV's" are fairly dumb. And even if they are smart enough now, you'll notice that they are getting relatively dumber every year, because they aren't updated enough to stay on the front line. A good example: in a few months, no smart TV will run Skype anymore.