300hp through the front wheels is perfectly possible, an LSD helps a lot though.
My Leon has about 260hp and an open diff. In the dry it will accelerate cleanly in 2nd gear without any issues, in the wet the front wheels will bounce along the tarmac in 3rd. I tend to the leave the traction control on in the wet! Torque steer isn’t really an issue, you can feel a slight tug at the wheel accelerating hard in 2nd but its easy to correct.
I remember when the older shape Civic Type R came out with 200hp, everyone thought it was bonkers for an FWD car, but the Focus RS has already broken the 300hp barrier, with quite a few compromises admittedly like useable steering lock. The new Cupra 280 shows you can get plenty of power through the front wheels too in a more subtle package.