> Your mental model is too naïve. Have you done this before? Have you then replaced it or added additional lines? I sell and run electrical work for a living (

> Your mental model is too naïve. Have you done this before? Have you then replaced it or added additional lines? I sell and run electrical work for a living (including low-voltage cabling), I have thought about how cables get pulled into existing walls in virtually any scenario you can contrive. Block, steel stud, brick, wood stud, precast tip-up; both drop ceiling and hardlid. Cutting open walls to install low-voltage raceway is very uncommon because it’s substantially more expensive (or just way more work) than cutting two small holes (or using an attic/basement for access) and using a fish tape. Non-professionals overestimate how many cables they’ll pull into existing low-voltage raceways in the future. Pull in an extra cable the first time and you’re future proofed.