If everyone uses turbo lasers then there is an in-universe reason for this, and its not because everyone but you is an idiot.
Well, the reason is probably energy requirements and maintenance. Now,
coilguns, on the otherhand, are able to be made in a way that they'd compete with turbolasers. If only as bombardment weapons/anti-shield weapons/anti-Jedi weapons. After all, a mach 20 projectile can easily end up killing you with the shockwave, and can be made to go through lightsabers by not melting fast enough, getting through the weapon to kill the Jedi.
Meanwhile, for bombardment and shield breaking, you can cram a lot more energy into a physical projectile than you can cram into a laser or plasma weapon, because you can always make better propellants or a longer acceleration system. Plasma shares the latter, but quite a lot of energy is lost to containing the plasma and plasma has rather little impact. Kinetic energy is also better than thermal for bombardment.
Also, physical projectiles get expensive and can do some rather nasty collateral damage on a miss. Granted, they're probably far better at busting shields than lasers, but lasers have this attractive property where you can always break any armor with enough exposure. Ablative plating only lasts so long and a good laser weapon will vaporize armor a few millimeters at a time if needed.
It's basically impossible to avoid Death of One Thousand Cuts against lasers, and the massive proliferation of lasers and plasma means that shields are probably extremely heavily specialized against electromagnetic forces. So a railgun will work great at getting shields down, but takes more maintenance and is easier to counter with armor than lasers/plasma.