Curious to know more specifics on why? If you care to explain.

My bet is that tons of user testing showed that users had no clue what a satoshi was. Just easier to use ‘bitcoin’

Dear Sir Jack Dorsey nostr:nprofile1qqsgydql3q4ka27d9wnlrmus4tvkrnc8ftc4h8h5fgyln54gl0a7dgspp4mhxue69uhkummn9ekx7mqpxdmhxue69uhkuamr9ec8y6tdv9kzumn9wshkz7tkdfkx26tvd4urqctvxa4ryur3wsergut9vsch5dmp8pese6nj96, I Need Borrowing You're Money And I will do whatever I can for you please help me. i beg you...

I was confused until someone explained that "sat is short for Satoshi" and that its the smallest unit of Bitcoin. Its not that hard to understand unless you don't want to, which is probably 99% of people.