I see, thank you. To be honest I have to meditate what you say and try in practice to really grasp it. I never had an unconfirmed transaction for long, and saw more the RBF scenario as theoretical. Now I understand more this in practice as being a necessary way to get a transaction passed if our software (in my case lncli) is to stingy by default.
Again, thank you, your answers were very helpful!
Are you a miner?