There are two fundamental reasons why a vaccine against covid isn't a good idea, even if it wasnt based on an experimental technology.
One, a vaccine injected into your muscle does very little to help your first line of defense against a respiratory infection like this, which is your mucosal immunity. Two, this virus mutates so fast that you'd constantly have to develop a new vaccine, very quickly, to keep up with the new variants or it's going to do nothing. If you have ever asked yourself why vaccinating against the seasonal flu isn't common or recommended, and there is no vaccine against the common cold, it's these two reasons.
