We had a plan - which was signing hungry young players from home and abroad. That was what Poch’s team was built on. And then we just stopped, thinking the squad was hard to improve, instead of buying young players to replace certain ones that we could sell or weren’t good enough.
Dortmund are constantly stockpiling young players for the future and then have someone ready to come in when they have to sell a star or replace someone not performing, while we just let the weeds get tall.
That’s the plan I liked. It actually started under Arnesen to a degree. As you say, Dortmund manage it, spending sane amounts. Obviously it’s a little different in Germany and I wouldn’t want to have their full approach ( hint of a feeder club for the big boys ) but they are to be admired imo.