He was going to bowl first in this test, merkin is cooked. Time for the people in charge to make some big boy decisions. His bowling now is also suffering.
I know this may not be popular with many of the Aussie fans after the events which occurred 5 years ago, but I'd have no issue if Smith was reinstated as captain (considering there's no one else at the moment that's knocking down the doors as a serious contender for the position). How much longer Smith wants to play on for is another question though, as there have been rumours circulating about his retirement over the past 12 months.
During the recent tour of India, I noticed a very obvious change in body language and team spirit among the other Aussie players throughout the remainder of the Indian tour when Smith filled in as captain after Cummins went back to Australia. Smith is better at the micro-managing aspect of captaincy on-field compared to Cummins.
This was always one of the risks choosing a bowler, let alone a fast bowler, as captain: the work overload.
I just took a look at the upcoming schedule in the World Test Championship and after the completion of this Ashes series, we've got a very lean 16 months of test cricket, playing only 7 test matches: 3 home tests vs Pakistan, 2 home tests vs West Indies and 2 away tests vs New Zealand - three series that we should win. That's all the test cricket Australia will be playing. So with that schedule in mind, I can see the selectors persisting with Cummins against those lighter-weight teams (no offense).
The litmus test for Cummins' captaincy though (assuming he's still captain by then) will be the 2024/25 home series vs India, which will be ten years since we last won a home series vs India, when Smith filled in as captain after Michael Clarke got injured during the first test (we lost the subsequent 2018/19 and 2020/21 home series under Tim Paine's captaincy). Also, that series vs India will largely determine if we qualify for the 2025 WTC Final at Lord's.