In most situations, not attempting to hit the ball "on" would be a "Foul and a Miss" and the opponent would have the option of having the balls reset to the position before the shot, rendering this tactic worthless:
The striker shall, to the best of his ability, endeavour to hit the ball on or a
ball that could be on after a Red has been potted. If the referee considers
the Rule infringed, he shall call FOUL AND A MISS
[...]
After a FOUL AND A MISS has been called, the next player may request
the offender to play again from the position left, or at his discretion, from
the original position, with all balls being replaced
(Official rules, Section 3, Rule 14 Foul and a Miss). However, my reading of Rule 14 is that "Foul and a Miss" cannot be called if snookers are required:
If the referee considers the Rule infringed, he shall call FOUL AND A MISS unless:
(i) any player needed penalty points before, or as a result of, the stroke
being played;
so Fu could perhaps have done this. On the other hand, there is Section 4, Rule 1:
In the event of:
[...]
any conduct by a Player which in the opinion of the referee is wilfully
or persistently unfair
the referee has the option of awarding the frame to the opponent. I don't know what counts as "wilfully unfair" for world class players.