Untrue. If a team is coordinated well enough, they can overcome anything.
That usually involves, you know, attacking in waves and helping the biggest, baddest class live to fight another day.
Like heavies
Who can't do jack anymore
Also waves don't do shit against a group with a medic
And scouts should no longer get close to heavies; they should spew at them from outside their range
And the generator can be stabbed by spies getting boosties onto the platform
That generator map is godawful