I used to be a fan of eyelets. Then I swapped my mountain bike from Mavic 319s to Stans Flow EX (to convert my MTB to tubeless for flat prevention). The Flow EX are 80 grams lighter and much more lateral stiffness.

After looking at everything the reason became clear. Old designs like Mavic 319/719/Open Pros/Open Sports have tall clincher beads and constant wall thickness. Modern tubeless ready rims have shorter beads variable wall thickness. The saved material is moved to the spoke track. With a thicker spoke track there's no need for eyelets. Combine that with variable wall thickness, properly designed thanks to CAD, stronger and lighter is possible for no additional cost.

In the two year interval I've sold off all my 319 wheels and switched everything to modern tubeless ready rims. Stans Flow EX on my MTB, SunRingle HelixTR25/27 on my GG/Tourer and DT R460 on my city bike. My road bike is running a Shimano tubeless wheelset.

Even if you don't want to run tubeless (today) TR rims are a better solution, they run tubes just fine and going forward you'll be able to take advantage of tubeless technology as it takes over the market.