Aus batsmen have simply bullied bowlers and dominated all teams at home since 2018.
If you take out India, then Aus record against all oppostions since Bumrah debute,
Aus batting average in Aus:
45 runs per wicket
Aus W/L in Aus :
20
Anyway you cut it, batsmen averaging 45 runs per wicket and team havin W/L of 20, that's simply a huge domination at home. It's irrelevant how Aus plays outside of Aus. They have absolutely dominated at home. This kind of record will be a dominating record in any era.
Aus at home agasint all teams( except India)
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Against the same Aus team in Aus,
Bumrah has 50 wickets at avg 17 and helped his team multiples tests/series.
That's define greatness , step up and win series/tests against a dominating home teams. Even without support he won first test in ongoing series. Some one may say it was one test, well that what all other teams have managed to win in Aus since he debuted. It's that hard.
Having a filler 100 wickets against minnows or bottom teams does not make anyone great except increase wicket counts to 300-400.
It hardly matters how batsmen are able to bat outside of home conditions when talking about Bumrah. Bumrah has gone in dens of good teams and won tests/series. Talking about some bottom teams not having good bastmen is meanigless for this disucssion. No one rates Bumrah becasue he took cheap wickets against WI and he has not filled his tally with cheap wickets against SL/Pak. His wickets have been mostly against good teams and it came in batsmen playing in their home conditions. Most dominating performance came agasint Aus in Aus where Aus batsmen are averaging 45 runs per wicket with W/L of 20 against all teams except India.