As per the Telegraph article I've posted on here before, if you look at the data then the performance of managers, as with players, typically drops off with age. Managers seem to top out in their early 50s and drop off quite soon after. Klopp, Guardiola, Mourinho etc. all seem to have faded at peak PL level from around 53.
I do know that - and as I have also posted on here before managers can also be too young and erratic, as well as too old. Again, similar to how players progress between the ages of say 17 to 34, managers seem to have a not dissimilar progression but of around 37 to 54. Players typically peak around 25-31ish, managers 45-53ish. Klopp won his PL title at 52, Pep his last at 53, Mourinho his last at 52. Consider the age of Slot, who has taken to the PL like a duck to water. On the flip-side, the youngest ever manager to win a PL title was Mourinho at 42 (2 years older than Amorim is now).
Ineos seem to have been aiming for someone who can be as successful as an Arteta, Klopp or Guardiola and ultimately challenge for multiple titles over many years, in which case you would want them for longer than an appointment like Glasner would give you if he does well. But perhaps Amorim was not ready yet, if he ever will be. Glasner is someone who is at his peak right now. The managerial equivalent of buying a Kane rather than Obi or Sesko.
"The average age of a Premier League winning manager suggests those closest to 50.5 (let's call it 51) are those at their peak "
https://www.telegraph.co.uk/footbal...avent-won-trophy-43-years-old-probably-never/
"The youngest manager to win the Premier League is José Mourinho, who won the title with Chelsea in 2004-05 when he was 42 years and 94 days old, living up to his own billing as ‘The Special One’."
https://theanalyst.com/articles/youngest-managers-to-win-the-premier-league