Hey, re batteries with removable caps... for most cars, i.e. those with accessible batteries, I would be willing to pay extra to get a battery of this type (and to be able to test individual cells with a hydrometer (hyGrometer ?). It is opportune to be able to ensure individual cells are not running low in acid; adding distilled water, charging, and then finding out the specific gravities of ea. to early-on learn if the battery is becoming weak. Load tests are good too, of course. I've been able to nurse-along batteries some years beyond their Best-Before dates in this way... but for my older cars.
I would not advocate, though, having a less-than-stellar battery in a Maser, i.e. electronic modules intensive car!