Sure, but every time I tried another CAD tool, let it be Eagle, Orcad or even circuit studio, I decided that I would rather stick a fork into my eye than to continue using that tool. It was serious tries, because the company already had license bought, before switching to Altium. Didn't give KiCAD a serious try yet, I'm not sure I have the time, I rather focus on getting my job done than the software.
Isn't that common with any kind of software or field?
I'm proficient at Windows because of my background but to be able to learn Linux it took a lot of time (and still today I'm learning new stuff) and it will be a very big while until I get the same level of proficiency as I have with Windows.
Same happens with Adobe Photoshop and Gimp. I've been trying to learn Gimp and heck I quit so many times because it simply I am better at Photoshop and what takes me minutes in Photoshop would take me half an hour in Gimp because I don't know my way around it.
Same as SOLIDWORKS and now trying to migrate to Solid Edge. Although kinda similar I'm still some times frustrated while working with it.
Specially if money is on the line, and speed and effectivebess is needed you go to the tool you are familiar with.
Same reason why big companies as Altium, Adobe, Cadence, Siemens, Dassault and so on have student licences and accords with universities for their students to use their tools, making such users reluctant to later change platforms, forcing companies to have to use the same tools if they want to extract the max productivity of their hired talent.
It takes a lot of self indulgence and persistence of the person to take such a step, and some simply can't for other reasons outside of their own objective of improving.