@jseyfert3 leaves his intex up, uncovered, through our harsh Wisconsin winters. Perhaps he can chime in, but he hasn’t reported any issues.
I've got a 26' round Intex. Been up for two winters now. Set up in June 2020, it's now starting it's third season. The dual outlets to the filter I plugged with the black "top hat" plugs that came with my pool from the inside. I unscrewed the filter grids on the inside of the pool, unclamped the hose, and while holding the hose on the outside pulled the filter grid mount out of the rubber hose stub piece that's welded to the liner. Then I inserted the plug from the inside of the pool. Once done, I removed the hose from the outside of the pool.
I only did this once actually, in summer of 2020 after I added a skimmer and stopped using these outlets and exclusively used the skimmer. Plugs have been in place since, no leaks, through two winters.
For the rest of winterization I removed all the hoses and valves. Valves all went inside. Hoses in the outdoor chest. I took the pump inside though in theory it's fine to leave outside. I left the sand filter outside with the drain plug out and the 6-way valve in the "N" position, with all hoses removed.
Only "issue" I had was related to the drain plugs. At least on mine, on the inside of the pool there's a flap plug, and on the outside of the pool there's a twist on cap. Some water leaked into this and popped the cap out by a thread, and it was dripping water out of the pool. This is a concern as the ice layer dropping from water draining could snag on the outlets and tear the pool. I was a little worried for a bit, but I was able to tighten the cap up on a slightly warmer day and the leaking stopped. It did not return the rest of the winter.
It may be best to make sure those inner flap plugs are fully seated, then remove the twist plugs from the outside of the pool, to prevent this from happening. That could be worse though? Not sure. At the very least, I'd recommend removing the twist plug and making sure there's no water leaking out of the flap plug. If no water is leaking out, the twist plug can be replaced and it shouldn't cause any issues since there won't be any water in the space between the two plugs.
I wish they weren't there at all to completely remove this risk, I use a submersible pump to do the partial drain for winter anyhow.