IMO it's not the Fire stick, it's the delivery over Youtube. Splicing in the commercials remains a challenge. You might try Hulu for its free trial. Costs a bit more for version with no commercials. Hulu+ is the streaming version with the cablelike channels.
I believe when 5G delivery gets popular and is hanging off every telephone pole (what's that?) or available delivery site, things will change a lot. Smart phone users won't see much of a difference except in faster download speeds. But those speeds will make streaming services (Sling, Hulu+ and more) competitive with fiber delivery.
That could mean that your new internet delivery provider will be very much pushing a new way to get you internet at very high speeds. But attractive bundles will include entertainment delivery as well. No studdering, no buffering.
Of course, the ones with owned content (Comcast, Time Warner etc) may have an advantage. (That's why you're seeing Xfinity and Spectrum pushing their cell phone service so hard.) Bad enough the smart phone carriers (Verizon, AT&T, T-Mobile) have cells all over the place for their proprietary delivery but when 5G providers start to look for additional places to hang sender units, there will be mucho buildout. If only they could get together and establish one company to do the buildouts for all providers.
So your Fire Stick may not be needed then but that's a few years away. Delivery of your internet (all that anyone will need; bye bye traditional cable companies) will be from a "pole" within 1000 feet of your home. Privacy will be reduced because your specific entertainment streaming habits can be captured down to how many minutes you watched a show, if you binge watch etc. Not like a co-ax cable that had all content in it and the cable company had no idea what you watched. And we all hope 5G is safe.