I agree with all you're saying, basically unless you replace all the parts you are putting stronger parts in the system (new) and leaving older, weaker parts in, and with 30 psi, you're bound to force a leak somewhere.

I'll be picking up a GAS cap to keep my pressure at manageable levels and to pre-emptively hopefully extend the life of my cooling system components. GAS doesn't mess around, their DISA rebuild kits are bulletproof so I don't gather I will have any ill effects from this.

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2018 Ram 2500 6.7L Cummins 68RFE
19k miles -Bright White/Black - Big Horn Sport - Crew Cab Short Bed
2013 X5 35D (CEO's) - Born on 5/17/2013 -
82k miles - Alpine White/Cinnamon Brown/Premium Pkg, Sport Activity/Premium Pkg and Sound/20" Style 214/Running Boards