Calling timeouts to stop momentum is a philosophy thing.
The greatest to ever do it, argue against it:
Phil Jackson: In his memoir, Eleven Rings, he explained his decision to withhold timeouts when opponents had momentum. He noted that when a coach steps in too quickly, players stop reading the floor and start waiting for answers from the bench. By letting the game continue, he forced his players to recognize momentum shifts, communicate, and solve problems on their own.
Dean Smith: He detailed this strategy in his own memoir, A Coach's Life, as well as his leadership book, The Carolina Way. He explained that if he had properly prepared his players in practice, they should be able to recognize mistakes, adjust, and play through adversity without him rescuing them from the bench. Further detailed that timeouts are strictly for clock management and late-game execution rather than emotional resets or coddling.
John Wooden: In his autobiography, They Call Me Coach, he explained that he rarely called timeouts to stop an opponent's momentum or draw up plays. He famously wrote that games are won in practice, not on the bench, and if he had to interrupt the game to tell his players what to do, he had failed as a teacher during the week. Also noted that players develop true court leadership and self-control only when they are trusted to solve spacing and defensive breakdowns on their own in real time.