My SCT has held its collimation well over the decades, despite being driven around a lot, including on very rough ranch roads in the Davis mountains. About the only time it has gotten truly out was from shipping it back and forth to Hawaii for the Venus transit. It was handled so roughly that they cracked a fork in its original shipping packaging, and bent the DEC shaft over 90 degrees. It is a wonder that the optics survived, but it was enough to throw the collimation out noticeably.
Back in the 90's/2000's Meade SCT's were bad about not holding collimation from what their owners said. I don't know if that is still true or not. And I have read some examples of folks having to collimate frequently after adding Bob's Knobs to SCT's...making the "need" for the knobs a self-fulfilling prophecy for some. I won a free set at TSP many years ago, but never collected them as I had no need for them.
There are other things that can happen with Maks and SCT's that can appear as collimation problems. So I have wondered how many of the "needs frequent collimation" claims for any particular scope are actually manifestations of other alignment issues that masquerade as collimation. Wonky diagonals, loose/decentered secondaries, secondary baffle tubes sliding (on some Maks), loose nuts on the primary baffle to primary, even a loosely threaded backplate (on a Mak) come to mind.