Statpadding and Anchor role are important for survival in Test cricket, just OK in ODIs but criminal in T20s. So can a statpadder like Virat Kohli, Babar Azam, KL Rahul and an inadverent statpadder like Mohammad Rizwan win you any T20 World Cup?
So are they of any use to the team or just a disgraceful liability occupying spots of other deserving players?
You cannot merge the two together. Stat padding is a selfish and negative thing. It's not a role or play style but rather a selfish act in Cricket. Where the player is just going about maintaining or boosting their own stat.
Anchor type players as you have mentioned are specialized players like power hitters. They are more consistent, more reliable, less risk taking and more finely tuned in their technique.
Now depending on what you mean by winning the T20 World Cup this could mean a few things. Because Cricket is a team sport. No single player is enough to win a whole tournament. Lets assume you are talking about winning contributing significantly to winning the WT20 Final. Which is arguably the most important game of the tournament.
The answer is Yes to that and not only to that but in all games. That in T20s you still need one or two anchoring players in your XI. A few examples of Final matches are enough to back this notion.
WT20 2022 Final. Ben Stokes 52 off 49. Strike Rate of 106. Abysmal and stat pad innings if you take it out of context. But is actually the innings that won England that Final. Why? Because England were chasing 139 on a pitch that was doing something and against Pakistani pacers specially. The supposed power hitters who were trying to muscle the ball were getting out. They needed an anchor type of innings.
WT20 2016 Final. Marlon Samuels 85 off 66. Strike Rate of 128. Sure Baithwaite hit those 4 sixes but other than that West Indies were rolled over in that innings. It was Marlon who held one end and ensured they stay alive in the game.
WT20 2010 Final. Craig Kieswetter 63 off 49. Strike Rate of 128. No body remembers this guy. But he played his best innings and a trophy winning one in the Final. It was an anchor innings. Why? Because the team needed it.
Overwhelming number of WT20 Finals have not been particularly high scoring matches and the role of an anchor type innings or an anchor type player who can play an anchor type innings seems to be not only a box tick. But a requirement just even for the Finals. Other then this there have been numerous anchor innings that were matching winning for their teams throughout the many matches of these WT20s.
This is still very much a 20 overs game with bat and ball. Despite the overwhelming favoritism to high scoring matches, road like flat wickets and a demand for entertainment from the broadcasters and fans.
You will still have average total matches. You will still need solid technique anchor players who can wither the storm in tough environments. You will still have to rely on a batter or two in a game where you batting line up collapses and you clutch on straws looking for someone that can carry and maintain one end of the pitch.