Firstly, Thailand is perfectly entitled to target only wealthy retirees.
However, to join the Elite scheme, you either need to be truly Elite and have so much money that the sum is insignificant OR for those with normal finances, it's necessary to trust the Thai government will honour the Elite scheme for the duration, without downgrading it or adding other costs.
The Elite scheme is supposed to buy residency rights for a period.
However, if I'm not mistaken there was a period in 2020 when Thai citizens were allowed to return to Thailand and Elite members were not. So that's a fail already.
Then with all the chopping and changing elsewhere, who says whey will not add other requirements for Elite visa holders ?