Is that really what they were doing, though? Based on the Ashes series I've watched, I'd dispute that characterisation.
And if by 'wobble seam', we simply mean not bowling with it bolt upright all the time, claims of novelty are probably over one hundred and fifty years behind the times.
Charles Kortright stated:
If you find the scans from
The Bowler's Art, you can see a bewildering variety of grips. Even as swing became more prominent, bowlers didn't forget cutters and slower balls. I remember reading an interview where a team-mate noted Jeff Thomson used bowled two or three cutters an over, much of the reason being to survive the eight-ball over without overexpenditure of effort.