If you literally transplanted our 2008 team as they were then into now then they wouldn't be even remotely as effective.
You're effectively talking about a time pre Guardiola's Barca versus now when all the top coaches (Klopp, Tuchel, Conte, Simeone, Naglesmann, etc.) have been directly influenced by that Barca side, aided by 13 years of development in sports science and analytics. The level of preparation that goes into build-up, pressing, defensive/attacking transitions, etc. at the top level now is miles ahead of what it was back then.
Hell even forgetting the very highest level like the CL, it's now common for mid level PL teams like Southampton, Brighton and Leeds to come into games against us with pressing games beyond anything we'd have faced from similar level teams in 2008. How would we possibly be as effective as we were back then unless we developed tactically too?