Lot of problems exist of the most blockchains. The problems of other blockchains and XBY don't comparable at this moment therefore i just say some headwords:

Limited blocksize vs. unlimited blocksize
Lot of energy required vs. no extra energy required
reward is given to miner vs. reward shared between the STaTiC ( service providers )
unneccesary work ( mathematical calculation ) vs. required security checks
all blocks stored to all miners vs. cloud type shared storage
fixed transaction cost  vs. service based cost ( cheap or zero transaction cost )
limited number of transactions vs. extreme high number of transactions
political governance problems ( not trust and anonym ) vs. provider releated and trust
p2p style network vs. overlay network
...
and many more

And answer of your non technical question is: Just read my first words of the beginning of this project. This is experimental project. I just want solid and stable platform who help the crypto world making better.