I agree it's not a problem. But who cares. If the result is important it will be replicated.
The problem is opportunity cost. There's usually a big lag between research getting published and being formally replicated - or debunked. Meanwhile, grants are awarded and lots of FTEs get burned to do research based on work that turns out to have been shoddy. All that time and money could have spent on research that actually proved or disproved something. "Aggressive" doesn't really enter into this problem (lack of aggression is a better topic for a discussion on science funding priorities, not design of experiments). Are skiers who take the time to buckle their boots not being aggressive enough?