not really to there being less physical obstacles
Depends on availability. Plenty of eateries don’t have vegan options and this is especially true for locations accommodating larger groups. Furthermore, a lot of vegans need supplements (as I’ve been told), which is also subject to availability.
Lastly, it’s easier to convince a thousand people to eat less meat – especially since they usually already have the ingredients required for vegetarian food at home – than to skip meat alltogether.
Two thousand meals a week that turned vegetarian is a lot more impact than 70 meals turned vegan.
Plenty of eateries don’t have vegan options
Maybe you are thinking of processed vegan food, like a vegan nugget or hamburger. That is completely unnecessary. beans, lentils, chickpeas, seaweed, grains, rice, vegetables, nuts… those are widely available and enough for a healthy diet.
For the rest I agree, it’s easier to convince an omnivore to go vegetarian than vegan. But that has to do with their will, not with actual physical limitations.