Signal getting worse for months. South west England

[AlanBayley]

I called EE and asked to talk with someone technical but It was virtually impossible get any  straightforward answers, everything is just too complicated to explain apparently . My straightforward explanation is 4 & 5 G does not offer the same coverage as 2&3 G but with a strong signal 4&5 is potentially much faster. So do you want the unlikely opportunity to experience extremely fast internet or be able to hold a conversation with someone. The network providers have decided it’s not “good to talk” anymore. It’s pointless changing networks they have all gone the same way. Oh and many of the cells can’t handle peak traffic.

[bristolian]

It's not the "G" that dictates coverage quality, it's the frequencies in use.

Low-bands provide a good coverage layer, where high-bands provide capacity. 4G is the base coverage layer and often exceeds that of 2G, but this is due to low-band deployment, not the "G" (radio access technology)

Not sure whether the explanation you've cited is yours, or that of a CS agent. If the latter, it's unsurprising but inaccurate.

The relative performance of some networks does vary wildly.