Short answer, efficiency.
Long answer, technology has gotten better at creating smaller and smaller components. When TVs were new and electrical engineering was in its infancy, a 13” tube TV needed a buffet table sized cabinet to hold all its workings. The ability to make circuit boards and processors was so primitive. Now we can right all of those components on a chip the size of an Oreo cookie.
Through advancements in programming and construction we can now cram more information in the same space.
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