Wales has a population of 3m, England has a population of 55m. Why do you think things should be equal?
given England (London) is paying for furlough, you can understand them wanting a say in when and where it is put nto place. Furthermore, the reason Wales needed earlier furlough was the disastrous start to the pandemic we had due to Drakeford and some of his policies.
Wales may have had those resources but they did not have the manpower or the capital to exploit them. The labour came from the midlands and Ireland, the capital from Scotland and Yorkshire.
As for renewable energy, we aren't going to create a sustainable economy from this alone. Wales currently has a fiscal deficit of £15bn per annum, and if we taxed all economic activity at 40% of GDP in the way the UK does, we would need to increase our GDP by £37.5bn just to cover existing public spending. Our current GDP is £70bn so we'd have to increase economic activity by over 50% overnight.
Wales also has around 1 in 4 workers in the public sector compared to 1 in 5 for the UK. If we have the same amount of funding then around 75k public sector jobs will be lost as we won't have the money to pay for them. That's 5% of the workforce. If we don't want to lose these jobs then we have to increase taxation, on one of the already poorest regions. Inward investment would dry up and would simply locate over the border.
Plaid only care about making Wales Welsh speaking, they really don't care about much else.