No pictures of your kids that they might not want spilled into a searchable database and used for machine learning to sell them things later in life?
No private or symmetric keys which might be used to impersonate you or eavesdrop on you later?
No in-progress documents which you aren't ready to publish?
No conversations with political allies that you might not want the state to peruse?
No intimate conversations with sexual partners?
If that's true, then I think you have a very different attack surface than most people. I think most people are willing to take a small performance hit not to open up access to much of the data that goes across their CPU, which is not an exaggeration for the combination of attacks which have been published against Intel CPUs over the past 3 years.
At the end of the day the only secure computer is one that's turned off and locked up in a supply closet.