This was never the main argument pro-mandate people had. The argument for mandates was that herd immunity would be compromised if a sufficient number of people chose to not to vaccinate thus risking the population which would not be able to get vaccinated such as the immunocompromised.
> Personal choice and body autonomy should be something we all support.
I think this is true up to a point, where that point is is what should be argued. I think if a disease were sufficiently deadly and had a long incubation period such that it would allow itself to spread rapidly, we'd all argue that vaccine mandates should be enforced.
For example, consider the following hypothetical. Suppose a reliable vaccine existed for virus X with similar side-effects to current COVID vaccines. Virus X has 95% mortality for children and is as infectious as COVID, i.e. very infectious. In this scenario, would you still be opposed to vaccine mandates? Even if it had a 100% mortality rate for children and/or were even more infectious?