I get the same number of feats. With going further in fighter, I gained better jump which allows me to get into position a lot easier. And I wanted the extra attack out of fighter as well. Supreme Sneak wasn’t something I needed or wanted. Most of my team couldn’t keep up with Lae’Zel and Astarion jumping up front and murdering everything in sight.
So really, I gained more mobility and a full extra attack and all I gave up was a single 1d6 on sneak attack.