@deep_333 Yamaha and Technics are so underrated! However, the low efficiency of Technics speakers in general made me look the other way.
The story of old manufacturers recycling old designs is best exemplified by Focal. Their drivers have even gotten worse over the years for "economy of scale" reasons. The materials are of cheaper quality these days. The new Focal Vestia line is using tweeters from the Focal car electronics division.
I am a bit perplexed about your statement regarding KEF. The build quality and engineering of the KEF LS50 is hard to beat for the money (you literally have to go to small boutique manufacturers which underprice their goods or assembled DIY projects with quality parts). The KEF R3 Meta measures extremely well regardless of price. But I'll concede that measurements don't tell the whole story. If it were the case, all amplifier companies would go out of business and everyone would be using class D mini amps from China (forshadowing maybe...).