Artik most of that makes no sense. If it did, why does the USN rely on land based tankers so much still?
The problem with dedicated tankers is that they are big and when not in use do not provide any added value
No added value? Considering that now the USN has to use UP strikers to perform tank duties, where as with a dedicated tanker force, those aircraft are now added to the strikers and fighters column. There is a reason creating a CVN based tanker is a priority with the USN right now, even gone so far as to test the new UCAV as a dedicated tanker to free up strikers. A single dedicated tanker would be able to do the job of a 4 ship or even 8 ship of buddy tankers. A dedicated tanker isn't THAT big, no larger a deck footprint than what the AWACS birds would take up, plus as already stated, the current force structure of a carrier air wing is FAR smaller than what the ships can handle in the first place.
Your point that the strikers/tankers can do both jobs - actually, no they can't, not simultaneously, when they are set up for buddy refueling, they are doing THAT job, not striking, the USN doesn't task their SH set up with the buddy refuel tank to do strikes as well, THEN become a tanker - it's tasked as just a tanker, again, removing it from the strike capable aircraft at that time. Yes, it can be used as a striker instead of a tanker just by configuring it so on deck, but then there wouldn't be ANY tankers available if that was done, and the entire point is that the SH/Hornet's range is pretty short for a striker, thus the need for tankers in the first place.
The SH is a fantastic strike fighter, however it IS very range limited. Considering the range of land based anti ship weapons, and the range of anti ship fighters and strikers potential threats have, this is not very far, hence the huge use of buddy tankers. Buddy tankers have NO advantage, it's all in the minus column, again, those SH aren't part of the strike force and then somehow magically become tankers to tank everyone on the way home. It's one mission or the other. Since there IS so much free space left in the air wing, why not use a dedicated fuel bird and free all those strikers up, as the range issue isn't going away for the SH unless some magic new propulsion system comes along.
Range is of major importance - what makes the Russian carrier so poor - aside from the constant breakdowns, but in terms of theory - is that it's aircraft and strikers have such limited range due to the non-catobar ski jump deal. The SU33 has to be downloaded in fuel and/or weapons just to get off the deck, the Mig29k is an improvement, but still has a range and payload that's even worse than the Superhornet.