They all could be designed to display SWR but on the lower end radios it's a matter of additional cost.
On an FT2900 it's a $150 radio. A small meter cost about $60.
Would you rather pay $210 for the radio with the feature or buy a seperate meter and have it for the next radio.
When you install them you normally do an SWR test and adjustment on a dedicated antenna for the band using an external meter anyway.
Unless something goes wrong, you don't need to see SWR all that often.
Even if it changes you can't do anything about it unless you stop and check it out then do the fix.
A small external meter will do just as well.
I don't think the commercial radios even have the feature.
Working into repeaters as you drive, the signal level changes anyway wether due to SWR or location so it's not a feature you really need like on an HF band where you chase the frequency with a VFO and may need to retune especially with an amplifier that's not broad band and an antenna whose match needs attention vs frequncy.
Also, an SWR of 1.5 = a power loss of only 3% plus transmission line losses.
An SWR of 2 = a loss of 11% plus line losses.
If you have a power output with very little SWR of 5 watts, an SWR of 2 looses only a half watt plus line losses so not even missed at the other end..
At 3 to 1, the loss get up to 25% plus line.
The more important thing is not to lose the final device in the radio when the match gets to high and causes either the current to rise overheating the device or the RF voltage goes too high risking loss due to junction distruction.
Good luck.
