I can "divide" a single $100 bill into 100 $1 bills.
By your "logic" $1 is just as valuable as $100.
By your "logic" $1 is just as valuable as $100.
New shares can be issued at any time.
If MS issues new shares, they will increase the total amount of shares. If you divide one BTC into smaller parts, it doesn't mean that the total amount of BTC has increased.