Is there an EVSE that doesn't have this problem?
This discussion might interest you: https://old.reddit.com/r/evcharging/comments/15blqlj/how_som...
Or let's phrase it like that: If the proper cables are used and if the wiring isn't absolute dogshit next to other absolute dogshit the cited reason isn't the reason.
Try to induce 5mA of foreign circuit into a cable on purpose and you will see what I mean. Measuring equipment exists so we don't need to guess here..
The issue is more that manufactureres calculated with a 30mA threshold for ages and if they did a bad job, they produced equipment that just barely made that threshold. Typically such norm changes are known well ahead, I am more familar with European norms, but changes like these are known a decade ahead.
So it isn't as if manufacturers of such equipment are suddenly surprised by new regulations. And if the new rule starts to work that should only affect newly built unints (or units where the electrical installation is renewed). So if your EV charger trips the GFCI because of bad electrical wiring, thr wiring likely had to be replaced due to new norms anyways..
Why the thresholds for different areas differ is usually a mix of historical reasons, lobbying and a "we didn't get around to that yet". It is hard to answer such questions in isolation, maybe marine equipment has other maintenance cycles, crazier cabling requirements, maybe there are fire suppression measures that allow to relax that requirement more, maybe it doesn't make sense at all.
As someone who has read through nearly 100 GB of norm PDFs I can assure you that just comparing two thresholds in isolation is practically worthless if you ignore the other differences in the rules.
I'll admit I don't know what kind of currents they see, but 5mA on transients wouldn't be particularly surprising. There is also the factor of how sensitive the GFCI is.
And if it’s resistive leakage, that’s almost a watt of dissipation - also huge and probably a short in a cable and potentially a fire risk.
5mA is a massive threshold for well designed devices
If your device is constantly tripping your GFCI, that was a decision some bean counter (or totally clueless contractor) was willing to make, not a god given inherent fact of the universe. All that you know is that the think could be saving your life as the fault current has to go somewhere that isn't back into the system. But of course now the US has an unelected car manufacturer in government, so it is important to let them reduce the quality of things so they can make more money. The actual solution is to test products before they hit the market and test/overhaul dangerously wrong wiring in houses.
If your gas safety valve keeps shutting down the gas because your gas bottle is heating up next to the flame, vuess what: the solution isn't to remove the safety valve.