How often do you actually switch between streaming services or mess with your TV's menu?
That's worth asking because it changes the calculus a bit. The earlier answers nailed the core trade-offs - manufacturer support vs. simplicity - but there's a practical middle ground most people don't think about. Smart TVs have gotten genuinely better at this stuff since 2019. The built-in systems (whether it's Samsung's Tizen, LG's WebOS, or whatever) are way more stable than they used to be, and you'll likely get 4-5 years of app updates rather than the 2-3 years of deeper support people sometimes claim. That's enough for most people's lifespan with a TV.
The real kicker though: even if the TV's smart features eventually get sluggish or stop updating, you're not stuck. You can always plug in a Roku stick later for like $30-50 without it being some emergency backup plan. It becomes more of a "nice to have" than a life raft. With a basic TV, you're already committed to needing external hardware from day one. So grab a mid-range smart TV now (and yeah, the price premium really isn't huge anymore), use it normally, and don't stress about obsolescence. If it gets wonky in five years, you'll throw a stick behind it and move on.