It is unlikely that Klopp managed to build such a team with a limited budget, they spent a lot of money, but at some point when the team was formed they only bought or sold several players, so in recent seasons their have been spent in the transfer market were less, than that of Arsenal, which was just forming the team with the arrival of Arteta. By the way, City are also not spending a lot of money on the transfer market now, but initially their spending was very large.
Yes, the Klopp did a very great job in Liverpool, but he was also not an ideal coach, he had good seasons and there were times when the team was going through hard times, but he was constantly with the team, and Klopp is definitely associated with Liverpool, it’s hard to imagine him in to another team.
A team that already has or has found its best performance will of course not need many more changes so that it spends a lot of money in the transfer market, in contrast to a team that has not yet found its best performance or is currently developing, they will spend a lot of money in the transfer market and that is normal. Previously Liverpool and Manchester City also spent quite a lot of money in the transfer market.
Klopp built Liverpool from the moment he arrived, there is a character attached to the team with Klopp, I see it as similar to Man United and previous coach Alex Ferguson.
So Klopp's departure will of course create something missing in the Liverpool team that will be difficult to find again.