"Why not" turns out to have quite an expensive answer (both in silicon and runtime latency). If you just cipher using a standard algorithm like AES then perform

"Why not" turns out to have quite an expensive answer (both in silicon and runtime latency). If you just cipher using a standard algorithm like AES then performance isn't great, but adding integrity protection to it further slows that down. Of course, you can use a lighter cipher, but then you don't have the years of cryptanalysis that gives everyone some assurance. I think the jury is still out on AMD SME and Intel TME in terms of their respective performance hits.