The frequencies are so easily blocked by anything that you need transmitters everywhere and receivers everywhere - literally 5G phones will have to have 3+ separate 5G antennaes in different locations to avoid the signal being outright blocked by your hand.
5G devices will practically need line of sight to a transmitter.
There is 5G and there is 5G mmWave. They are two separate parts of "5G". There are still advantages to sub 6GHz standard cell phone frequencies such as lower latency and higher throughput.
The disadvantages you mention only apply to 5G mmWave.
The frequencies are so easily blocked by anything that you need transmitters everywhere and receivers everywhere - literally 5G phones will have to have 3+ separate 5G antennaes in different locations to avoid the signal being outright blocked by your hand.
5G devices will practically need line of sight to a transmitter.