If you read through my comment on the Lamborghini Huracan Tecnica page, you will understand why the Super Series lineup DOES NOT compete with Huracans and 488s (or F8s).
In addition to the 488 Pista actually rivaling the 620R and not the 765LT (let alone the Senna), McLaren has the Sports Series (now rebranded as Artura) to compete with Ferrari's moderate supercars [and of course, the GT to rival the Portofino M and Roma, and the grand tourers from Lambo's cousins Audi, Bentley and Porsche].
Like I said, Maserati and Aston Martin are not as well-established in the exotic industry as Porsche (the sole owner of Audi and Lamborghini), Ferrari, McLaren, or even Mercedes-AMG (now taking role in Nurburgring records) is. Why not BMW? They simply gave up on building real supersports cars since the Z8 (no, the M8 doesn't count).
Super Series is the serial-production FLAGSHIP of the McLaren family, just like the Aventador and SF90 Stradale are serial-production flagships of its Italian competitors. The ultra-GTs are 911 Turbo S and 812 Superfast; and their mild track-day packages come in the names of Lightweight Package and Competizione, respectively. The 911TS and 812SF are also remarkably faster than their 911 Carrera GTS and Roma brothers.
The 296 GTB is the F8 Tributo's successor, so it's not a flagship, even if it's as fast as the 720S. Most importantly, regardless of straight-line stats, it's positioned as an Artura competitor.