Understood.
Having similar concerns regarding what the options would be in the future, I opted to use the 65k method, for the mere fact that I would never allow Thailand (or anyone) to put controls on my bank account and/or spending. That's just the bottom line with me.
The 65k method has been in place for decades, after it was revised from something like 50k/month for expat retiree's which was in place for many decades previously. I just don't think the monthly income method will ever be removed as an option for residing here. But that's just me thinking out loud. Each person has to do what they feel is best, and this being Thailand, nothing's ever for sure.