My experience with 5G is that it's strictly worse than LTE. At this point, if I see the 5G symbol on my phone I'm conditioned to expect the internet to barely work. Requests frequently seem to just hang.
Telcos typically downrate 2nd-tier data, so if it's there's congestion, we feel it most.
I used to have major problems with one network one particular street corner where data throughput would reliably drop to zero on 5G, but calls still went through somehow (even though they're also data on 5G, albeit with a different QoS). Signal strength was always shown as full. A phone restart would sometimes, but not always, fix it – without moving anywhere!
Never happened again since switching away. 5G is a standard/protocol; it doesn't somehow inherently prevent bad network management.