Question regarding MY slippage in winter conditions

For context - 2023 MYLR, factory all seasons (tires have plenty of tread depth, not balding by any means and have been rotated twice @ about 15k miles in when this occurred)

We have driven in winter conditions a few times, but are not “experienced” winter drivers

So this took place a couple of months ago, we found ourselves having to drive for a few hours during a winter storm. All of it took place on a major interstate highway, that had a good amount of plowing/maintenance running

We pretty much could not go above 30-35 mph without awful and constant slipping. Again the highway was constantly being plowed so it’s not even like there was any thick layer of snow. It wasn’t related to regen braking because the constant slipping would happen even when trying to maintain a steady 40 mph

Meanwhile pretty much every car around us was able to easily do 60 mph and seemed like they were having no issues at all the whole way.

The snow eventually turned into freezing rain later on, and it was the same story. Other cars doing 60-65 without a problem, us trekking along at 30 otherwise constant slipping.

I’ve heard on the MYP there’s adjustments you can make with track mode to help, but that obviously doesn’t apply to the LR.

I ask about this because there’s a good chance we will be moving to a winter climate later this year. We’ve been puzzled for a while about this.

Was it just that everyone else had snow tires and we only had all-seasons, and snow tires make that much of a difference…? Is the MYLR just not very good in the snow? Is it something about the factory all seasons?

Any tips/advice appreciated!