There's no such thing as "no ballast LED". They're really integrated ballast, just like corkscrew CFLs and they suffer from same disadvantages.
In the earliest days of USB, the power was 5v 0.5A, then it was increased to 1A.
These days, may mobile devices regularly charge at 20W and beyond, but no modern mobile phones, tablets or PCs import class 1 (120-277v) into the device directly.
Some of you may have heard of USB-C PPS. The idea isn't just to improve total efficiency, but to maximize as much of losses as possible to the external power supply to minimize thermal losses within the handset to as low as possible. Same applies to lighting ballasts. Can downlights that use PL-T lamps 26 and 32W lamps use amalgam lamps to tolerate operation at high temperature, but no way in hell integral ballast can tolerate the heat, so they use remote ballast. You don't see enclosed rated 32W PL-T with integrated ballast, because the ballast can't take the heat.
For high lamp density, high ambient industrial environment, integral ballast T8 lamps are not ideal. Best is constant current remote ballast so the ballast is isolated from the lamp heat and the ballast losses do not contribute to luminaire thermal loading. This will ensure longevity without absurd comprises such as simply allowing flicker by eliminating capacitor. You don't want electrolytic capacitors in the luminaire housing.
Integral ballast T8 L.E.D. lamps intended to replace 0.88 BF 32W T8 lamps operating at 2400 lumen are often rated below 2000 lm each. Integrated ballast would be fine for such replacement intended in conditioned space.
However, LED retrofit to replace specular parabolic shoebox high bay with six or eight 2900 lumen lamps operating at 1.15 BF to yield 3300 lumens is unconditioned, high bay is a different matter. They often operate in unconditioned space and the ballast are often premium efficiency type rated for 90C case temp operation. No LED drop in will achieve the output and provide T8 equivalent lifespan.
