I have a friend who has always been challenged by maintaining a consistent seam width, she loves her guided foot and her foot up/down button, and cannot live without her clip thread option.
I use a vintage machine as my standard machine (and have been using it for about 25 years now) and am pretty accurate with my piecing - I have zero machine options really, but I do have a good strong straight stitch. When I use my cheap modern Brother at classes or whatnot, I'm always taking multiple tries to do things that I don't even think about on my regular machine. Mostly it's what you are used to doing.
A friend of mine has offered me a nice modern machine she has but I have to go visit her to get it... I'm looking forward to the visit (tentatively November) whether or not she actually gives me the machine, that's not the purpose of the visit. It does have automatic threading and with my vision issues that would be lovely to have. Forget what brand my friend likes, but she likes nice things...