Altras and Topos don’t work for me and it’s more due to the stack height than the drop angle. The thing that forced me into the Vivos was a nerve injury that means I cannot tightly lace shoes or boots anymore. Pair that with a tall sole stack and it’s a train wreck. My foot slides around on top of that sole making it very unstable.
The Altras and Topos are also basically disposable because of that tall squishy sole. They start compressing almost immediately. If you have any pronation, they just go to hell in a handbasket really quickly. After less than a month, mine were sloping outwards toward the outside of my foot.
I also agree with the comments here about zero drop affecting calves and tendons more than knees. If you are wearing minimalist shoes, you are going to reduce your heel strikes and minimize impacts on your knees. If you don’t, your heels are really going to hurt.
The calf/tendon issues associated with zero drop are not because someone has big or muscular calves. It’s because wearing those stiff boots has resulted in limited calf mobility and ankle/foot strength. If you are having this problem, consider adding a regiment of regular stretching, calf raises using a board or a step to allow full extension, and consider getting a Mobo board and consulting their website for flexibility exercises.