It depends on what you're looking for, and also what you have.
I built a home NAS a decade ago, and have been making 1:1 digital versions of all of my media, including 4K UHD disk-based titles, since then, and can access what I want, when I want without having to even think about stream quality.
My home theater is good, but nothing crazy (LG OLED, Denon AVR with 7.1 Klipsch speaker setup), but it is enough to notice the difference in many instances.
Additionally, when traveling I can just copy the files to my laptop, and watch the content even when there's no internet access, all at the same level of quality.
Currently, I'm subscribed to several streaming services, and they're used frequently, but when I want a movie night, I look to my collection, not Netflix.