Mint is aimed at normies. The fewer barriers to entry, the better. If you give users the option for a “clean” install there will be people who select it, not knowing what they’re doing, and then end up with a borderline non-functional computer as far as they’re concerned. To put it another way, they expect it to have stuff pre-installed. Finally, what counts as essentials and what counts as bloat? Text editor? Media player? Photo viewer? Internet browser?

That being said, I understand why you might not like getting extra programs you didn’t ask for. Luckily, they’re very easy to uninstall and forget about.