Eh, I don't know.
The old Monogram kits are fantastic for their age, and in general yeah, they're much simpler builds than more recent kits, but I'm not sure that's a reason to bag on said recent kits. Honestly, I think it requires a kit-by-kit comparison.
I'm currently painting Monogram's P-47 bubbletop. I remember building it when I was a kid, so it's definitely fun to revisit it for nostalgia's sake. And, coming off Zvezda's La-5 (great kit, btw), it's kinda nice to go from cockpit to mostly-complete build in about 8 pieces.
But it has its downsides. A lot of the detail is kinda soft. The blast tubes were awful, and I'm replacing them with tubes taken off a Tamiya kit. The cockpit's pretty nice, but molded as a one-piece tub that makes detailing kind of challenging. The gunsight is laughable. The engine and intake separators are molded to a single insert that jams into the cowl. Detail on the engine face is decent, but falls way short of modern approaches. Then there's the flash, the ejector pin marks that run along all the major seams and have to be knocked down, ejector pin marks on external surfaces, heck, even the copyright is molded onto the underside of one of the stabilizers.
The fit is...decent. The fuse goes together well, but there's a small step along the entire central spine that has to be dealt with. The wing root gaps are so bad that I had to tack strip styrene to the top of the wing join before welding them to the fuselage. And there's probably a 1/16" step between the wing undersides and the fuselage.
I'm not complaining - I'm having a lot of fun with this kit - but it's not the Tamiyabolt. I don't even know if I'd say one's "better" than the other. They're both great kits in their own way. But it's kind of apples to oranges.