Few decades ago bowling round the wicket was a rarity for fast bowlers. It was similar to bowling a slower ball.
Today every right-arm fast bowler will go round the wicket if a batsman is a left-hander. It is interesting to find out that bowlers are able to modify their run-up/action so that they don’t run over danger zone. In fact lately a rise in % of warning for running over danger zone when bowling over the wicket!.
I noticed this tactic employed by English bowlers with great success in 2005 Ashes to constrain Australian left-handers and in particular Adam Gilchrist. Probably they watched the previous series Australia played against New Zealand at home, where Chris Cairns was regularly bowling round the wicket with great effect…although he did not have enough support from other end.
At the conclusion of Ashes 2019 – from 181 wickets that went down in the series, 56(30.93%) were from bowling round the wicket(all type of bowling). Not surprisingly 28 of these dismissals were for single digit score.