I have spent 4 years in this role, we have built the same system 3 times and only first and second versions are successful. (Generates most of the revenue for o

I have spent 4 years in this role, we have built the same system 3 times and only first and second versions are successful. (Generates most of the revenue for our PA) the last product was not engineering driven but product management driven and failed. We are launching a 4th product with new product management and engineering and everything looked promising, everybody was very excited as we will put in practice all the learnings and failures, then suddenly new eng manager comes with 0 background and makes decisions that will set us back again 4 years. I'm going to leave because is hard to stay in a company where the experts are not listened. I guess some new manager come and want to shake the boat making the decisions just because or plans just because...this is normal. I have learn to live with this pattern