I have been here 14 years using a retirement extension originally arriving with a Non O? and have never been required to take out medical insurance,
The 90 day reporting takes about 14 minutes a year out of my life.
Sure I have to keep the money in the bank but everything in life comes at a cost and I cannot think of too many Western countries where non citizens or unless married to a citizen of that country one can arrive without a visa and stay indefinitely, certainly not in Australia my home country.
As far as the ever changing rules and hoops you have to jump through don’t recall any changes being applied to me.