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https://itch.io/t/247375/house-collection

https://itch.io/t/118471/saturns-wood-furniture-collection-featuring-build-a-bar...

Well, what do you think the answer might be?

but look at this video fore example

here kenny doesn't use walls, he uses blocks, so is it possible to make an interior afterward ? does using blocks provides more creative freedom ?

Why would he be making interiors if he doesn't need to? Why would he be wasting game performance and development time on interior walls the player never sees?

Most games keep their house interiors on separate maps.