So apparently every big Sonic anniversary that comes every 5 years is close to or in the same year as the release of a new Nintendo console. Think about it…
1996: Sonic’s 5th and the launch of the Nintendo 64
2001: Sonic’s 10th and the launch of the Game Boy Advance and Gamecube
2006: Sonic’s 15th and the launch of the Wii
2011: Sonic’s 20th and the launch of the 3DS (and one year close to the launch of the Wii U)
2016: Sonic’s 25th and one year close to the launch of the Switch (where the anniversary games were released)
2021: Sonic’s 30th and the Switch has still yet to be retired