Mismanagement? I don't think so. As a former business owner for 33 years I know bad management when I see it. Mismanagement is like the Browns and Dolphins. Snead was fighting to quickly and I mean quickly win over a new market. So he made some splash signings to use them as bridge players while he signed and developed a talented group of young players. Even now this roster is loaded with talent top to bottom.
Two years of outstanding success won the market for the Rams and they fell one game short of their goal. That is not mismanagement. Mismanagement is when a team is perennially circling the drain like the aforementioned teams. IMO last year's failures were two-fold. Key injuries and two players on the right side of the o-line that exposed themselves to be the marginal players they are. Now add in coaching failures and again they fell short. Not because of a lack of talent but the failures of players like Havenstein, Blythe, and Zuerlein they fell one game short of making the playoff. But again they finished with a winning record.
The problem is with media and fans who are totally into instant gratification. One down season after two excellent ones is hardly worthy of the moniker of mismanaged. This is a young team and it's building a nucleus of elite players. Look at who they have now.
Ramsey, Long, Rapp, and AD with young veterans like Floyd and Robinson on defense. Brockers is a better than average DE but when you look at his age and contract he's a place holder until they bring someone up behind him. Both Gurley and Cooks are gone but they held significant long term injury exposures, and so how could the management anticipated Cooks concussions and Gurley's decline. The Rams did the correct thing in terms of management and cut their losses to move on from them.
In 2018 and 2019 the team invested draft capital in the o-line with two very solid prospects in Allen and Noteboom. When drafted did the doubters cast doubts when they were drafted? I don't believe they did. I still believe the team was correct in their evaluations. So the Rams won their market while building a core roster of a championship-caliber team. That is good management not bad. Anyone can nit pik and take things out of context but if you don't you see a team almost out of transition as a true contender.
Bad management are the Chargers who have shown their incompetence time and time again much like the Dolphins and Browns. There isn't a team in the NFL that can dominate the Rams if the Rams simply don't give the game away. As a fan what more can we ask? No, my friends, this team isn't mismanaged. Have there been some missteps? Sure, but what franchise including the Pats hasn't had them. This team is 33-15 over the last 3 years. They don't have that success (69% win ratio over the last 3 years) without good management.