It is already well-documented, in many sources, that Windows 10 is the most secure version of Windows ever.
Calling the "Speech, Inking, & Typing" feature (which, by the way, I have turned off and always have) a keylogger so perverts the term as it was always used that it becomes meaningless. There are lots of things, including the auto-complete/auto-predict features of almost any web browser you care to name and search engines as well, that do precisely the same thing. "Keylogger" was once used, exclusively, to denote something that tracks keystrokes to transmit to an unknown third party for "nefarious purposes." It was not used in reference to software of the predictive text and/or predictive search categories which, by their very nature, must know what you are typing at the moment and what you have typed in the past if you want them to work. These can generally be turned off as well.
Telemetry is used by every contemporary OS I know of, and the data is aggregated in order to determine trends related to specific configurations. I have seen, during several major release roll outs and a couple of regular patch cycles just how useful this can be to prevent the dreaded "bad update" from getting very far out of the corral before being stopped in its tracks. There is no way that Microsoft could ever create a testbed where every possible configuration upon which people are running Windows is represented. This has been true for decades now. A great deal of havoc has been wrought when patches/fixes/upgrades went out that passed testing, but that blew up when hitting specific hardware configurations that were not tested. Data collection was via calls to Microsoft Support or other communications to Microsoft Support, which was painfully slow by any comparison to what can be and is fed by telemetry, and it could take days or weeks to determine that there was a major problem and what, exactly, the root cause might be. With basic telemetry those sorts of issues can be identified within minutes to hours of the first patch/upgrade cycle and the process halted when that's indicated so that root causes can be determined. I'll gladly take that system, thank you.
The only advertisements, if you can call them that (and I would), I have ever gotten under Windows 10 were several promoting Microsoft Edge and the Windows 10 Mail App. The very first toggle on the very first page of Privacy settings is, "Let apps use advertising ID to make ads more interesting to you based on your app usage (turning this off will reset your ID)." Turning that one switch off nukes your existing advertising ID and forbids apps to use the advertising ID. Problem virtually completely eliminated, and it stays that way.
Anyone who's bothered to do a network traffic analysis on their earlier versions of Windows, Windows 7 and later, and compared the data volume that is sent back to Microsoft on those systems and on a user-clamped-down Windows 10 system will see little difference if system health telemetry is taken out of the picture. One can legitimately argue that these choices should be opt-in, not opt-out, but it's not as though the fact that they are, indeed, opt-out has not been discussed ad nauseam since before Windows 10 was out of the Insiders Only phase of development.
What it comes down to is that anyone who wishes to make themselves aware of what they need to do to configure Windows 10 as closely as possible to their wishes can do so, and quite easily. You can't make people care and the sad fact (and it is sad) is that the vast majority of people are more than happy to be blissfully and willfully ignorant. Those who don't fit this mold can find out what they need to know and what they need to do with some very cursory web research.
The former group is the classic, "You can lead a horse to water . . ." type while the latter seeks out the water on their own.