Try being that guy that understands the memory management of iOS. Safari in iOS deliberately limits the amount of memory used. Just because you might have 8GB of free memory in future iPhones doesn't mean Safari will use all of 8GB to keep tabs live. Safari wants to be a good citizen in iOS so it is mindful of how much memory is used. Why would Safari do this? Well, reloading tabs does not use as much battery as launching a new app from a cold start. For example: let's say you have 8 apps in the background, but you launched 10 new tabs in Safari. If Safari used all of the available ram, those 8 apps in the background will be closed. Launching those 8 apps from a cold start instead of resuming from background would use substantially more battery than reloading 10 tabs (and I'm factoring in the LTE usage).
Whether you have 4GB ram today, or 6GB of ram tomorrow, you're still going to have tabs being refreshed. It's just how Safari in iOS was designed.