I'm finding the phrase 'good mother' or 'good parent' interesting. Where else would we still refer to the good wife, good girl, good boy, good son, good daughter? Parents are, as all people in all roles, complex creatures.
With all the best intentions in them world, loving and caring for their children, they will NEVER get it all right, meet all their offerings needs at all times. And then there is life and all the challenges it can bring. This could be bumps in a marriage as people can be imperfect and behave in difficult ways, money worries, work stresses, stress with wider family and add to that a range of disabilities physical or inter generational neuro divergence. It can be a bumpy ride.
Cutting your parents off can be warranted if they actually abused you or if they continue to be very controlling, lack health boundaries and are selfish, not listening, not actually seeing their children, giving them space to be who they are. But these children and adult children will have many flaws of their own. I wouldn't judge anyone who feel they have to limit contact to manage their own anxieties but ideally parents and adult children muddle along. Mine are still teens I hope they won't look back with horror on their well intended mum who must have got it wrong many times.
One example. Older teen has been stroppy and cold to us for a while, I'm hoping it's the usual developmental detachment process. Every time I speak to her, she berates me and tries to pick a fight. She is not very caring atm and not all that responsive to my efforts to engage. I'd like to think that I'm a fairly emotionally tuned in parent and was recently told that 'you never ever ask me how I am'. I was quite taken aback as I have always tried to chat about their day, listen and talk things through. I instantly felt quite defensive and did not feel like accepting this 😅. However, I forced myself to not focus too much on my perceived unfairness of her criticism and I'm making sure I give her more of my time and ask her more often how she is. I'm not sure I'd be still that mentally agile and emotionally resilient to self reflect and change my behaviour in 20 years time, so perhaps a degree of understanding and forgivingness on all sides is a good idea, especially when parents are growing older.