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 Major security risk that for this price not even a display is included. Even a cheap Ledger Nano S is better (with knowing the recent data breach news). I think it should be redesigned. 
 Given everything including the hardware will be open source, anyone can add a screen if they wish. 

Everything is trade offs. Read our blog post on screens. 
 Why do we need a screen on everything ?  refrigerator to router ,  coffee machine to cars ..  
 
 I just want it to work 
 Because if you have any malware on your phone, PC, etc. You can't verify on the device that the Bitcoin address is not changed.