Creating robust Catalyst proposals can be difficult. Connection with existing structures and frameworks is time consuming.
DApps using off-chain data feeds can provide a richer end-user experience. There is no easy way to consume off-chain data feeds on Cardano.
DLT/Blockchain is apparently in conflict with EU-Personal Data Privacy regulation and with major GDPR PbD (Privacy-by-Design) principles
Your offline/online personal & business life is governed by laws & contracts you have to accept but don't understand, which have real consequences…