Whether your recommendation is valid seems to be quite CPU-dependent. Cf:

  cpu: AMD Ryzen 5 5600X 6-Core Processor             
  BenchmarkAES_CBC-12             100000000               10.96 ns/op
  BenchmarkAES_CTR-12             83161234                14.36 ns/op
  BenchmarkPCG-12                 345336063                3.463 ns/op
  BenchmarkChaCha8-12             174143492                6.894 ns/op
  BenchmarkXoshiro256p-12         254343658                4.717 ns/op
  BenchmarkXoshiro256pp-12        266837442                4.496 ns/op

vs.

  cpu: Apple M4 Pro
  BenchmarkAES_CBC-14             162698020                7.370 ns/op
  BenchmarkAES_CTR-14             242501074                4.954 ns/op
  BenchmarkPCG-14                 197000988                6.083 ns/op
  BenchmarkChaCha8-14             237430095                5.050 ns/op
  BenchmarkXoshiro256p-14         252911710                4.738 ns/op
  BenchmarkXoshiro256pp-14        252656401                4.745 ns/op

Code: https://gist.github.com/kbolino/afbb86f3c9b2bd2f87272801d156...