You don't say what your qualifications are and you don't link to anything

I am a cell biologist and bio-nanotechnology researcher.

It sounds like your statements are truisms about naturally occurring mRNA.

Fair enough, however, it is also basic cell biology. To a cell biologist it is as obvious as 1+1=2 to a mathematician. To an experienced cell biologist it has been verified by hundreds or thousands of personally performed experiments.

if the creator of the synthetic mRNA wants it to write itself into a person's DNA thereby changing their genome

Then they would do it another way. They would include all the technology required to get it into the nucleus, get it into stem cell niches, get it to actually express the required proteins to actually write to the DNA, etc., etc.

There are MUCH BETTER technologies to write to DNA (actual gene therapies). There are NO WAYS to do it with the ingredients listed in the mRNA vaccines. If these vaccines are altering DNA they are not what they say they are. All evidence supports the assertion they are what they say they are. What they say they are is bad enough.

Skepticism is a reasonable response when prior mRNA vaccine development for SARS-CV-1 was halted when all the test animals died when later exposed to coronavirus in the wild.

Yes, but pathogenic priming has absolutely nothing to do with altering DNA (exclusively).

I see no reason to take anybody's word that these mRNA injections are harmless when there have been no long-term human studies and no published animal studies.

I NEVER implied they were harmless. On the contrary, I spend most of my day writing, talking, researching, or analyzing how not harmless they are.

You also should not take my word for anything. Ask me questions. If I know the answers I will give them. If I can provide resources I will do so.