Because IMAP sucks on bad network links. It involves a huge number of round trips to synchronize the state, and re-establishing the shared state when the connection is interrupted takes forever.
A lot of online commenters refuse to believe this but the standard Gmail interface is highly optimized to cope with bad network connections, hide latency, and recover from interruptions. If you have the code assets and initial state cached in your browser, it behaves very well under bad network conditions.
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Because IMAP sucks on bad network links. It involves a huge number of round trips to synchronize the state, and re-establishing the shared state when the connection is interrupted takes forever.
A lot of online commenters refuse to believe this but the standard Gmail interface is highly optimized to cope with bad network connections, hide latency, and recover from interruptions. If you have the code assets and initial state cached in your browser, it behaves very well under bad network conditions.