Actually, Lard getting into foul trouble is NOT a concern based on last season's stats. His shot blocking ability compared to Jacobson's essentially non-existent blocks this season is a huge advantage as it not only affects the possessions where the shots were blocked, but on other possessions as well as it will make opposing players more hesitant to go into the lane.
Also, with increased strength/weight, Lard will be better able to hold defensive position vs. last year, which should decrease his fouls/game. He will also be more effective in the low post on offense which will open up the outside shooters much more than Jacobson playing in the low post, even though Jacobson has surprised everyone with some low post moves, esp. his baby hook.
Jacobson 2018: .1 blocks/game
Lard 2017: 2.2 blocks/game
Jacobson 2018: 1.6 PF/game
Lard 2017: 2.8 PF/game
Yeah, looking that he only averaged 3 fouls/game doesn't look concerning. Watching games where he had to sit because of foul trouble still concerns me. Fortunately, we have more depth if Young comes back.
Just to be clear on my position. I said it wasn't silly for people to have Jacobson start over Lard. Lard is much more explosive, but Jacobson stretches the floor better on offense. Lard is a better rim protector, but Jacobson plays better pick n roll defense. Both will contribute a ton and I'm glad we'll have options.