Firsty, them deciding what is suspicious and not suspicious
That's the major issue with all centralised entities, they have the final say on your assets that you entrusted them with. For example, paypal usually sides with the buyer even though the proof may be stacked up against them because they want to keep up with their policy of "buyer's protection". Good point but definitely not limited to banks only.
Not everybody is an employee working for someone. Some people are entrepreneurs, and as an entrepreneur, you can have some HUGE days. I don't need a bank telling me that my successful day where i made $20k+ is suspicious if I want to withdraw all of it. (people have been arrested for making large withdraws before).
I have never had this happen although i think they don't have the right to withhold your money. As long as you pay your taxes, you shoudl be set to go.
Also, banks freely allowing their customers to scam business (via chargeback). Instead of blindly chargingback purchases and screwing over merchants, visa applicants should be required to take a course outlining the risks of credit cards, and Visa should do proper investigations when a chargeback is brought up.
If a tracking number and proof of delivery can be proved, why should the customer be given their money back?
ALSO, i recently looked into banking investment options. It comes across as a way to just make more money off customers. Think of it like this. It's like it's just them taking your money so they can invest it in polyniex. I only tried it out cause my family (who doesn't know about bitcoins) encouraged it.
Do you have any gripes about banks
Agreed again, however this is more closely related to paypal than it is to banks. Usually banks don't reverse transactions unless it is made with a credit card or a court order is filed. But bitcoin is here to solve every issue you mentioned.