If you believe there was 3 years of control on Watt, then you don’t understand the CBA or the cap economics. The days of tagging a player more than once is long gone. The CBA allowed 1st round picks the opportunity to get big money after their rookie contract expired, with the 5th year option. The Tag was supposed to be used as a machine to allow teams to help keep “home grown” players. However, certain infantile owners (Jones, Davis, Snyder, Wilfs, etc) abused the spirit of the tag itself (incentive bonuses, poison pill clauses) to attract players.
The economics of the NFL now requires to build teams through their drafts and sign affordable free agents who don’t destroy the balancing act of cap space to position value. There is too much money to lose by not having a successfully winning franchise.