There are some VERY extreme and GLARING flaws in both GRIN & BEAM

1: How can we ever ensure that a single node hasn't hijacked the network and are receiving disproportionate rewards?

2: With addresses only being temporary, how would recurring payments be allowed? Verified? Etc? For example a shop has a Beam payment option. How would they give an address for payment that multiple visitors can use. Normally I would say this is a future issue outside of the fact that it's hindered by the core of the concept.

3: There is no need for these levels of privacy in cryptocurrency and to keep pushing for it in such a way only creates additional issues. There is NO way to know if BEAM or GRIN has been exploited due to the lack of addresses.