I can’t figure it out in the preseason! Why on earth can this substitute backcourt stay with the Warriors?

In a previous NBA preseason game, the Los Angeles Lakers defeated the Golden State Warriors 126-116 at home. After this game, the Lakers achieved their first victory in the preseason and currently have a record of 1 win and 2 losses; while the Warriors suffered their first defeat in the preseason and currently have a record of 2 wins and 1 loss.

In this game, the performance of the Warriors' substitute backcourt player Pat Spencer was simply a disaster. Spencer played for 19 minutes and 13 seconds. He made 3 of 11 shots, 1 of 5 from beyond the three-point line, and 1 of 2 free throws. He only scored 8 points and 1 rebound. He also had 2 turnovers and 1 foul. His plus-minus value was as low as -17, the lowest in the game. Spencer has no touch on the offensive end, his offensive efficiency is very unsatisfactory, and his ability to shoot from the outside is also very disappointing. As a backcourt player, Spencer's passing ability and organizational ability are not ideal. He also made outrageous mistakes, and he has obvious problems with his dribbling ability and basic skills. Not only that, Spencer was also beaten by his opponents in various ways on the defensive end. The team was in shambles when Spencer was on the court. His performance on both ends of the floor was very disappointing, and his poor performance also largely contributed to the team's eventual loss.

In the NBA regular season last season, Spencer played a total of 39 times in 82 games, averaging 6.4 minutes per game. He averaged 2.5 points, 1.2 rebounds, 1.2 assists, 0.4 steals, and 0.1 blocks per game. He also had 0.5 turnovers and 0.5 fouls. He shot 40.6% from the field, 22.7% from the three-point range, and 73.3% from the free throw line. In the playoffs, Spencer played a total of 8 times, averaging 7.9 minutes per game. He averaged 4.5 points, 1.4 rebounds, 0.8 assists, and 0.4 steals per game. He also had 0.8 turnovers and 1.1 fouls. He shot 64% from the field, 33.3% from the three-point range, and 100% from the free throw line. Since the preseason, Spencer has averaged 17.5 minutes per game in the first three games, averaging 8.7 points, 2.3 rebounds, 2.3 assists and 1 steal per game, as well as 1 turnover and 2.3 fouls. He shot 33.3% from the field, 25% from the three-point range, and 76.9% from the free throw line.

Spencer's performance last season was very average. He did not seem to have particularly outstanding talents. It was difficult for him to exert his value on both offense and defense. As a result, the Warriors still chose to keep him in the team, and he still held a two-way contract. As a result, in the preseason, Spencer's performance, which had received a lot of playing time, still showed no improvement, and his condition was still very worrying. The most critical thing is that Spencer is already 29 years old and he has no potential to tap. Under normal circumstances, the Warriors should definitely reserve two-way contract spots for players with more potential. What strong background does Spencer have that allows him to stay in the team?