I didn't forget anything. I was just naming examples from a particular period you yourself brought up.
Look, this is getting repetitive. I'll try to sum it up one more time:
1.) rate of engine development is restricted by tokens and by them to specific areas of the engine
2.) therefore it's hard for engine-manufacturers like Renault or Honda to solve their issues and become competitive
3.) there are many customer-teams who are supplied by these engine-manufacturers and have absolutely no ability to change their faith - they are effectively bound by the ability and competence of their supplier
4.) worse; most engine deals are not year to year (but multiple) and a central part to the car and its design so can't be easily changed year by year according to the performance
5.) when a team does want to change (i.e. RedBull for 2016), they are being confronted being offered B-spec engines because they might be too strong a competitor
It's not much different than having two tire suppliers and one struggling, being limited to improve and the teams that run on that tire being at the mercy of that supplier and the rules.
I'm not arguing on behalf of the works-teams who control their own faith by building the engines and integrating it into their own chassis all under the same roof. I'm arguing on behalf of every single customer team who is being supplied such an engine they have no control over, but are bound by complex agreements to those engines and if they do get out, face the prospect of either A.) competitive engine manufacturer not wanting to supply them or B.) wanting to supply them with an inferior engine.
I'm all for an engine dominated formula (over an aero one), but then I want to see 10 different works-teams and not 2-3 that supply themselves and the rest of the grid (and no fricking way with inferior ones thank you).
EDIT: alexx_88, great post (I missed it in the page turnover before). +1