Access. For most people, it seems hard to get a few thousand sats and easier to use their credt card to buy coffee.
another thing to think about is that when bitcoin will be more accessible to buy because more adopted, the actual value of it, will still put a big obstacle to acquire many bitcoin and then use it, so is not even an adoption problem is just about being lazy for many
You really can't call that lazy, since people aren't really educated enough on this subject. Now how do you educate one who does not want to be educated?
by forcing it at somepoint, the system will force those people to change, like it happened for many other thing in the past
for example look at the natural step of each tech, for Windows xp user were forced to buy s7 in the end(there are still few of them but they are the minority) the same can be said for those that were still avoiding email
when they realized that was much more convenient they forced themselves or they admitted they were wrong and started to use the new tech, with bitcoin the same thing will happen