If it's true what you say that "the result will be more profitable for landlords, and hurtful to tenants," then it seems odd that landlords are not universally applauding rent control.
It shouldn't be a surprise that more landlord-friendly rent control measures get less resistance from landlords.
When the market will bear an increase less than rent control, it gives landlords something to point at as justification and help mitigate turn over. When the market will bear a greater increase, it is unfair and harmful to communities, etc. etc. etc.