My LG OLED TV can be configured to load directly into a HDMI input. I keep it disconnected from wifi at all times. I never see the smartTV OS. It’s probably the best option because OLED panels are the best current display technology.
I use an AppleTV as an external media box for all my needs. But the same would apply for an Android box or HTPC setup etc.
I haven seen my LG OLED’s smart OS for years.