One of the reasons for using a antenna tuner on the HF bands is SWR bandwidth. On HF, an antenna might be tuned for the low end of the band, and would present a reasonably low SWR to the transceiver. But at the high end of the band the SWR may be rather high. A tuner, in this situation, wouldn't fix the high SWR problem, but it does allow the transceiver to see a good match. Some extra loss would occur, but loss due to high SWR is usually small, and that is often the just the price you pay.
On the VHF/UHF bands, antenna bandwidth is not as much of an issue. A 2 meter antenna with 7% SWR bandwidth (nominal bandwidth for a Yagi), will easily cover the whole 2 meter band with a reasonable SWR. So if the antenna is tuned properly, no tuner is needed.
They do make tuners for VHF/UHF, like the MFJ-922, but reviews are very mixed. They range from completely useless, to the eight wonder of the world.
If your antenna and feed line arrangement is giving you a 1.5:1 SWR, or better, across the band, you don't need a tuner. However, if your rig is cutting back on power, due to a high SWR, you are better off finding out what's wrong with the antenna/feed line.
Martin - K7MEM