Quite the opposite. Suzuki's defensive play was always poor; Habs fans are merely unable to perceive it because of their bias.
This article should be a splash of cold water on the irrational and utterly unsupported notion that Suzuki is a quality two-way forward, the next Bergeron, as so many in the fanbase hailed him.
Even strength play may not be that of a shutdown C, per se, but an analysis was made to demonstrate that Suzuki is one of the premier PK Cs in the league.
His defensive play is far from piss poor, but playing with a C like Dach as his RW enables Suzuki to take more chances and be more creative deep in the O-zone. Dach can become the first one on the back check and adequately take on the defensive responsibilities in our zone for the C.
There may be some rose-coloured blinders with some fans when it comes to Suzuki, but there is also some inexplicable hatred for him?
Suzuki is a quality two-way C in this league and ought to only get better with better wingers who have more experience in time.
Zegras VS Suzuki, for example:
Zegras is a defensive sieve. Suzuki is not. Both produce mid-60s in points, so far in their careers.
Suzuki is good at battling for pucks because of the way he uses his body to insert himself between the puck and the opponent so he can recover the rubber.
It's always easy to state a point without any analysis to support it.