Don't throw away traditional floss thinking it's outdated, because research doesn't say that water flossers completely replace it. Regular floss remains the gold standard for cleaning between teeth where your toothbrush can't reach, especially in tight spaces where plaque builds up the most. Water flossers are useful (especially if you have braces or implants) but some studies suggest that manual floss removes more plaque in certain spots - it's not quite the same thing.
That said, if after years traditional floss works fine for you and doesn't cause problems, there's no reason to switch. The most important thing is that you do interdental cleaning, period. If you find floss uncomfortable though, waxed floss glides better than unwaxed and is gentler on your gums. Or you can try interdental brushes if you have wider gaps: they're a solid alternative and often easier to use than floss.
The real mistake would be stopping interdental cleaning thinking the method doesn't matter. Whether it's floss, a water flosser, or an interdental brush, what matters is doing the job well and consistently. If your system's been working for years without gum disease or tartar buildup, you're not doing anything wrong.