The clubs you are talking about are longstanding successful clubs with room to expand their current stadiums.Several clubs have shown precisely what you're asking. Many have also redeveloped without any loss of capacity throughout the build. I've explained it several times. The Parkend could be extended to add 6-10k with a corner section and the the bulk of a new upper Bullens would be built above and behind the existing stand joining onto the extended Park end. Then the existing upper removed in close season and lower extended/reprofiled to add more new capacity. Much of this could be achieved at less cost per seat than the Anfield stands, as the construction volume is substantially less due to the considerably lower starting height. Therefore, the cost could be substantially lower than £300m, again as shown by these and other extensions elsewhere.
Approx 28-31k+ of the current capacity is reusable. There is no way that adding 21k or even 30k high value capacity to that will need to come close to the cost of half that of BMD..... and even it was that gap could never be narrowed. In fact, £300m would probably take that capacity comfortably over 60k with more corporate and more boxes than BMD.
That's why the majority of larger clubs have opted for redevelopment. Why the Bernabeu and Nou camp are doing similar... neither of those will look like cheap addlibs. Of course that's before you factor in the value of preservation of history or tradition or removing risk of unproven transport plans.
Goodison is not comparable.
Why dont you compare it with Arsenal ,Man City & more recently West Ham ?
Tom give it up mate its gone , done , its over , we are moving to Bramley Moore.