To the Johnson critics, do this:
Hire a tennis coach and tell that coach to make your serves perfect every time and then scream at you when the serve is not perfect.
And then tell that instructor to coach the #234 talent in the world and make that person's serve perfect every play. In fact, demand that #234 player make the top 10.
A team is only as good as the talent.
The best you can hope for is full effort and slow improvement.
And be able to recruit top talent.
The fact the tennis serve is bad sometimes is simply what it is going to be. Don't scream at the coach.
Incremental improvement. Talent.