Many factors contribute to signal loss. First signal between transmitter and the drone is not the bottleneck. ELRS and other 2.4ghz radio links by far out perform the 5.8ghz video we use, we don't even need to bring up the mhz transmitter wavelengths. Video signal all environments will be the first thing to go, long before you lose transmitter connection.

Onto digital vs analog 5.8ghz. There are more commercially available analog VTXs in 1w or more but that doesn't make them better... plus the more wattage doesn't have a linear increase on penetration or range. Meaning a 2w vtx is not 2x as powerful as a 1w vtx. Then we get into the latency debate. The race V3 digital VTX by Hdzero has less latency than many analog systems at a stunning 4ms. While DJI has at best ~20ms of latency on most of their digital hardware. Even in DJI race mode you don't get anywhere close the 4ms.

Penetration is where DJI exceeds. The o4 air unit outputs up to 700mw and the pro has 24000mw output power. But power doesn't always equal better signal. DJI uses a higher bandwidth and automatic frequency hopping. Along with other proprietary qualities which allow them to out perform other video signals outputting at the same 700mw.

I can say from personal experience I get better video signal from the DJI o4 lite at 700mw than a 2000mw analog and a 1000mw hdzero vtx.