Perhaps you could ponder these abstractions instead:What do you mean "ponder these abstractions"? The Victorian one would be in Mickleham, see this page. The Queensland government is also building one.
Where would these places have been built?
How many would be built?
For how many people each?
At what cost?
Where would the staff come from?
Why would those staff be so keen to not see their families for MONTHS on end?
How much would the staff need to be paid to be away from their families for that long?
For the arrivals that became truly ill how do you get them to hospitals quickly?
If you more or less have a hospital on site:
a) Where did that money come from?
b) Why do those Drs and nurses not want to see their families for MONTHS on end?
c) How much are you paying them to be away from their families for that long?
Where does the food come from?
Depending on how you answer those there are still more questions.
The system of hotel quarantine was fine, certainly better than what you propose, the root cause of the long lockdowns in Victoria were the lack of curtailment of movement in the population.
No, the system of hotel quarantine is not as good as what the Victorian, Queensland and Western Australian governments are proposing - an epidemiologist, Mary-Louise McLaws, said so.
What is the "lack of curtailment of movement"? This year, due to variants of concern and inadequate hotel ventilation, there have been multiple cases of these variants escaping quarantine and snap lockdowns due to them.