The tv will not get internet through the coax.
-if you feel your wireless is troublesome and it's easy to run a wire then i would.
Consider also just getting a roku with an Ethernet input and ditching the TVs apps altogether. The Tizen OS in the Samsung's is quite a bit clunkier than roku. And you'll save switching between the two.
If it's a PITA to run an Ethernet wire then you could try an Ethernet-over power line adapter. Sometimes they work great, sometimes average. Runs the internet over your home ac. "Might" be better than the wireless and is certainly convenient.
https://www.bestbuy.com/site/netgear-powerline-ac1200-gigabit-ethernet-adapter-2-pack-white/4002029.p?skuId=4002029