Tain't an ignorant question - it's a very GOOD question.
For my family, we currently do about 20 loads per week in a top loader. Average usage for a top loader is 45-60 gallons. That's 900 to 1200 gallons per week, or 46800 to 62400 gallons per year.
For a front loader, they hold about twice as much, and use about 15 - 18 gallons per load. That's 10 loads per week, so figure 150 to 180 gallons per week. That's 7800 to 9360 per year.
That's a savings of 39000 to 53040 gallons per year that isn't going into my leach field. Call it about 3000 to 4000 gallons per month.
That just might make the difference for your leach field.
And a side benefit is that you didn't have to pay for the electricity to pump that water out of the ground.
For me, moving my family of 8 into a house with a 2 bedroom septic, it's a no-brainer. If I have to replace the thing every 2 years, it still makes sense. (Along with low volume toilets, a hot water recirc system, and all of that stuff to reduce water usage.)
Do the math for your family and you'll soon see if it makes sense for you.