I think the criticism is of less self-contained time limits that involve multiple puzzles/locations. You can retry the mug'o'grog puzzle if you're not quick enough, I think.
Yes, the SCUMM Bar restocks with mugs if you destroy yours.
It's still a bizarrely high-pressure moment built into a game that otherwise has no such mechanics. I always hated coming to it.
It would have been at least as easy to tie the disintegration of the mugs to scene transitions, which would have eliminated the time pressure at no cost to the game.