Not quite comparable though I would say, given that you know what you're signing up for when applying for a job. Travelling to a conference is a one-off whereas you'd be expecting to come to your job everyday (given the contract states this). You wouldn't accept a job in another country and turn round expecting them to pay for your flights, hotel etc. to be in the area during the work week
Aside from being compensated directly for daily commutes (on which we could reasonably disagree), there’s also an issue around liability: if someone crashes going to work and the other side wants to sue, should the company be liable, the employee, or both? Being “on-the-clock” makes it more likely the company would bear responsibility, as opposed to being “off-the clock”. Company cars seem to be less common now than they were even 10 years ago. A personal injury lawsuit could easily bankrupt a household, but is much less likely to bankrupt a mid-sized or large company.
