While it’s possible some users might actually prefer shots that uses 4 bars PI, one needs too be aware, other things being the same, we may end up with over extracted cups. Of course, this can be corrected through some trade-offs such as gently assisting the lever to pull the shots at a lower pressure, temperature management, remove one spring, dosage, and so on. A simple remedy IMO is PI at 2 bars and letting the default pressure and temp management do the trick.
As @CoyoteOldMan and tompoland said, let the users experiment and find what works for them. What seems to work elsewhere may or not work here.
One needs to remember the Evo is designed as a dual spring group with an accurate temp management to get shots at 10.5-11 bars.
