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Not on anything decent after 2017. Prusa i3 MK3 has no threaded rod. Creality, Sovol, Sunlu, Tevo, etc all used extrusion frames for their i3s. MendelMax, Lulzbot, etc went extrusion very early on. Threaded rod Mendel's have way too much side to side movement.

Nothing necessarily replaced anything at any given point in time. But the first few RepRap printers were threaded rod frames. Very quickly the majority of sold kits were plywood. From 2012 onward it was a pretty healthy mix. But current i3 descendents using threaded rod? Would love some examples.

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I've only seen 2 i3 MK1s so far. I let Pooch from Repkord have the one I would have acquired. Frame wise it's essentially the same as the MK2. But the MK3 replaces the threaded Y rods with 30mm extrusions. We have a MK0 era 3mm build that has been updated with MK2 and MK3 parts but keeping it 3mm.