GMRS has a niche in prepper communications, but it has limited usefulness. It's great for local simplex communications, like a 1-3 mile range. Otherwise, you become dependent upon repeaters, which increase your radio coverage area, but repeaters add a possible failure point. GMRS also limits both your available channels and your output power of 50 watts. I typically use FRS/GMRS frequencies for neighborhood operations, i.e., looking for a lost dog, or checking in on snowed-in neighbors, etc. GMRS frequencies, which are located in the UHF band, don't propagate as well in rural areas, but they work well in urban areas, and they penetrate concrete reasonably well.
I have always stressed the importance of simplex (point-to-point direct) communications, whether VHF, UHF, or HF. Repeaters are wonderful devices, but they do go out of service, just like cell phone towers. The amateur radio simplex alternative offers flexibility in frequencies and output power up to 1500 watts. Simplex doesn't work everywhere due to topography, but in most cases there's a work around, whether improving antennas, using a different band or mode, or increasing transmit output.
Handheld radios are compromised devices, they're not designed to be used as base stations, or mobile radios. Use the appropriate device for specific applications. Sure, mobile radios can be used as a base station, or vice versa. Handheld radios are meant for portable operations. I've seen many newly licensed radio operators damage handheld antenna connectors or blow transmitter finals because they're trying to use the device outside of its design parameters.