mRNA vaccines have been well studied - from a scientific standpoint it's hard to imagine how it even could cause problems.
Here is an example of a long term problem caused by a (traditional, non-mrna) vaccine
https://www.cdc.gov/vaccinesafety/concerns/history/narcoleps...
As far as I know there hasn't been much research into the long term effects of many vaccines. After decades of availability if they were causing issues I hope somebody would have found a connection if they were causing issues. I would very much like to see research into this though.
I do agree mrna vaccines are unlikely to cause long term issues.
Just to be clear. I am very much in favor of vaccines. I just don't like being required to take it so soon after it was created.
So if you trust the decades of mRNA vaccine research, you should consider the vaccine strictly safer than covid, as getting the disease will expose you to everything the vaccine exposes you to.
I believe both mrna and traditional vaccines are safer than covid. I just don't like to take vaccines or medication without longer results than a year. I also agree mRNA vaccines shouldn't have any long term negative effects, but I tend to take the position when in doubt don't take an action.
If in 5 years there hasn't been any widespread negative effects I will probably take it.