Since we have two RNA vaccines against SARSCOV2 now, perhaps you should unfollow covidiots , libertarian flubros , Hoover institute faculty, GBD acolytes and every single individual who have suggested that a RNA vaccine against a CoV has never been developed before because ...

a (RNA) vaccine against a CoV has actually been developed before and within the same timelines that the two human vaccines are being developed in front of our own eyes. Enter PED - porcine epidemic diarrhea, a disease that appeared in North America in 2013 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3911415/

PED is highly contagious and devastated the swine industry:
https://www.farmprogress.com/blog/pedv-impact-swine-industry
Similar to COVID19 it is a mucosal disease (it affects the GI tract) but turns guts (rather than lungs) into mush
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4742593

PED hit the US in May 2013. By June 2014, Harris Vaccine Tech had received DoA conditional license for its vaccine. This vaccine put the spike protein of the PED virus into their the SirraVax RNA particle platform
The vaccine was highly effective in *challenge* trials

In this tech, one takes the RNA of interest and packages it inside replication deficient aphavirus virion particles. Dumbing things down tremendously , this vaccine (as well as the Pfizer and Moderna one) use lipid+/-protein "wrap" to deliver RNA against the spike protein

The vaccines are highly immunogenic (compared to other options against the CoVs) , they avoid skewed immune responses https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7117160/ they are not disease causing and trigger both cellular and humoral immunity https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4742593/

A rudimentary search on the internet would have revealed all of the above (I did the search in March) and would avoided falling for the intellectually deficient, death cultists who advocated for doing nothing , because nothing could not be done since nothing had be done before.

Look again at the timelines of the PED: 13 months from sequencing the virus until full deployment and control of the disease.
Science works, wear a mask, avoid groups and indoor activities, don't get killed in the last few months of the pandemic.

RNA AND ORDER !!!!

After that vaccine, Zoetis developed a killed inactivated viral vaccine which is very similar to one of the Chinese vaccines under development for SARSCOV2
https://www.zoetisus.com/products/pork/porcine-epidemic-diarrhea-vaccine.aspx
But for months, you'd be hearing: "we have never developed a CoV vaccine"