This is all opinion and speculation, but I think that for the vast majority of people that IS is important, it’s just that most don’t care if it is optical (in lens) or if it is IBIS.Fine, people on the Internet are discussing it. Canon ILCs don't have IBIS. Canon sells more ILCs than any other manufacturer, and has done so for 16 years and counting. Half of all ILCs sold are made by Canon, and none have IBIS. Another quarter of ILCs sold are made by Nikon, and only two of them have IBIS, and that's only been true for the past 6 months.
So, to sum up. 7 out of every 10 posts you see discussing system vs. system cite IBIS. Over 7 out of 10 ILCs sold don't have IBIS. Therefore, IBIS is not important for the vast majority of consumers. Period.
Personally, I think that the best solution is a hybrid system that uses both and I expect to see that hybrid system in higher level Mirrorless cameras. Since the R and it’s younger brother are both low end cameras, I am not surprised in the least that they do not have IBIS.