Whatever works for you works for you. You have made your choice and it makes you happy, that is all that matters for you.
But for this longtime pro who has used the best of pro DSLRs from both Nikon and Canon for the past four decades, including owning and using my Canon 1DX MkII, the move to fullframe mirrorless has so many performance advantages for me in a highly competitive workplace.
The top News Services around the world agree, as they have dumped their Nikon and Canon DSLRs and moved to fullframe mirrorless gear for all their staff photographers and staff videographers worldwide.
These News Services in the past 24months have gone to Sony A1, A9II, A7RIV/V, A7SIII, FX3, FX6; and to Nikon Z9. None have stayed with their Canon 1DX Mk3 or gone to Canon mirrorless either for their staffers.
Here are their reasons to move to mirrorless in their own words:
https://alphauniverse.com/stories/why-the-associated-press-just-switched-to-sony/https://petapixel.com/2021/11/17/sony-is-now-the-exclusive-camera-provider-for-gannett-and-usa-today/https://www.dpreview.com/news/4545693607/the-uk-largest-news-agency-partners-with-sonyhttps://petapixel.com/2022/01/31/canadas-largest-news-organization-moves-exclusively-to-sony-cameras/#:~:text=Canada's%20Largest%20News%20Agency%20Moves%20Exclusively%20to%20Sony%20Cameras,-Jan%2031%2C%202022&text=The%20Canadian%20Press%2C%20the%20largest,provider%20for%20the%20media%20company.
https://petapixel.com/2022/06/09/how-pro-photographers-helped-make-the-z9-from-prototype-to-flagship/Surely on a cost basis you are saving money going used and staying with what you know, what you are comfortable with and what lens lineup you already have.
For me and others it was worth it to move on from DSLR cameras and DSLR lenses to better mirrorless camera performance and features, with better, more modern, more compact lens optical designs and better linear lens focus motors.
Sure it was partly an emotional decision to part ways with my Canon and Nikon DSLR gear which I relied on covering all subjects around the world from pro sports to war conflict coverage.
I did pretty good financially selling all my Canon and Nikon stuff, and putting that money towards my move to Sony. I have owned Sony A6500, A7RII, A7RIII, A7III, A9, and currently own and use A1, A7RIV, A7SIII. I currently have 13 E-mount lenses covering from 10mm to 600mm from Sony, Sigma and Tamron.
Nearly six years since my move to mirrorless back in January 2017, I have absolutely no regrets with my move and I miss nothing about those big bricks of those Nikon and Canon DSLRs. They still are good cameras that still make good shots no doubt, but just arent for me anymore.
Cheers and best to you and your decision to go used Canon DSLR. For many that will be the way that makes sense for them.
Full disclosure, I kept one Canon lens, the Canon TS 17mm f4 Tilt-Shift lens which I use with the MC-11 lens adapter.