I didn't say that at all.
I think it probably made sense for them to do it at the time because it was their first attempt at a primary body without an AA filter. (As far as I'm aware.) It would be a bit nuts of them to make a fairly significant mechanical change, no matter how good, without giving people an option to keep with what they're used to. Like I said, some people clung on to film for years after it was obvious digital had surpassed it. Some people still swear their film-era lenses are better than modern ones. So there were always going to be some people who wouldn't want to buy a body with a feature like that which the Canon line hadn't had before. There will always be resistance and some people need to be eased into new ideas. So making the regular 5DS made sense for then.
But now people have had that chance to be eased in and other companies have ramped up their use of non-filtered sensors to the point where most new ILC bodies don't have AA filters, right? At least ones in the professional price range. So from this point, releasing pro cameras with an AA filter becomes less necessary and you will eventually get to a point where the amount of people buying the bodies with filters aren't enough to offset the cost of making both versions.
Nikon did this before with the D800, right? They made a regular one and the E model which has the AA filter reversed. And the D800E was way more popular and since then they've just stuck with not having a filter. I don't know about the latest Sonys (mark IIIs and 9) but the A7R definitely sold more than the regular A7, both the originals and the mark II versions.
Canon kind of did a similar thing before with the 1D bodies, if you remember when that line was split. They did the 1D and 1Ds. Then they added a 1Dn and the 1DC. All of them did things slightly differently so people could get the version that had the features they were most comfortable with and needed. But eventually they all got folded into the 1DX models because the people who used to think only resolution matter started feeling like speed did matter after all and the people who thought they only wanted speed decided they did want resolution and the bigger sensor and splitting the models up is more expensive than making one model which takes the best parts of all of them.
So I think making the 5DS and 5DS R made total sense as Canon's first try, but for the second version it will just be the 'R'. I think the 5DS, 1D and 7D cameras will dump the AA filters and the 5D, 6D and 90D will be the ones that keep the filter. So the 5DS (no filter) line is your solution for people who want maximum resolution and the 5D (filter) is the line for people who want a bit of everything. Eventually, like the 1D+1Ds=1DX, technology will get to the point where the 5DS and 5D lines can be combined back into one and we'll have what I guess we could call a 5DX, which would have no filter and high resolution and speed and great video, like how the 1DX does everything the 1D and 1Ds lines did combined.