Both extreme ends of the equation for the healer DPS debate are its own form of elitism and should be curb stomped into the ground, in my opinion.
My own thoughts about why the issue is so polarizing is because of the way the game is designed, it's entirely possible to be a successful baseline healer with a very low skill level which then in turn leading to a massive skill gap between those who are successful at a base level and those who are essentially 95+ percentile healer DPS. This in turn leads to massively varying opinions about what is "right" when the baseline for success is set at a very low level.
Outside of low ilvl progression, a zero-DPS healer won't cause a run to fail but will instead impede the speed at which success is attained. With that being said, players in general looking to confront EX Primals and Savage raiding should understand what it takes to become more successful and efficient with their kits to reduce progression failures.
I feel it's important to note the difference between DR and Savage level raiding because players looking to find success quickly in Savage raiding will need to have a mindset of continual improvement versus DRs where any Tom, Dick, or Harry will be able to succeed. As such, I also feel its important for people to distinguish between the level of skill required to complete the content and comments made towards those contexts because broad stroking generalizations just continue to stroke the the flames of this polarizing issue.