My own comments for what they're worth:
Many of Bramah's "varieties" such as the 2a (small curved marking to the left of the foot of the 4) could be regarded as trivial (and almost certainly non-intentional) alterations to a die and not truly therefore a recordable variety in Peck's eyes. The intentional overdates are listed by Peck. There are comparable examples in the bronze range that Michael Gouby lists but Freeman either ignored or mentioned in footnotes.
Secondly, once the baby boomer generation has passed away, the generation that never uses cash, paying for everything with cards or phones, won't be remotely interested in tiny differences in something they never use or see the point of.
And our coin collections will be worthless..............