That isn't a personal opinion that is what the analytics and stats are suggesting, should be happening if the Leafs intend on winning games.
Marner gets almost 25 minutes of icetime a game which is over a full period a game and playing alongside the Rocket Richard trophy winner as top goal scorer in the league. So both access and opportunity to flourish statistically.
In his last 18 playoff games played the Leafs have lost 11 of them, and in those 11 losses over 3 playoff years now Marner has produced 1 ES 5v5 assist and 1 X PP assist total. that's it and that's all..
Summary 11 X Leaf losses (4 X BOS, 3 X CBJ & 4 X Mon) and Marner contributed 0 goals 2 assists and 2 points
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. How hard could it be to find a player capable of scoring a single goal or supplant those 2 assists that might have swung a single game from a loss to a win and advanced the team to the next round?
The Leafs over the past 4 playoffs have been in 8 series potential clinching games for Toronto and their record is 0-8 and Marner's contribution is 0-2-2 points in those games.
If Marner isn't scoring goals and isn't setting up very many particular in meaningful games that ALL resulted in Leafs losses than why bother playing him? Fish or cut bait, and stop vacillating and act on something or disengage from it.