I’m not single, so this is not my issue now. I do however remember what it was like to be single, not sure if I wanted to marry, certainly not having any children yet as I wasn’t even married, and not feeling called to a religious vocation that was open to me. I felt like the Church didn’t want me because I did not have a spouse and kids like you were “supposed” to have. I felt left out. I’m sure there are other single people who may feel the same way.
Now the Church can either tell them “that’s your hangup, single people, and you just don’t understand the meaning of a vocation till you either get married or join the priesthood/a religious order” or it can try to find a more loving approach that is also likely to keep a few of them from feeling isolated and estranged from the Church on top of perhaps already feeling lonely and uncertain about their lives.
it would be wise to take the more loving approach, especially since there is nothing inherently sinful about being single.
Mary Magdalene was single, and not a member of a religious order, nor can she be seen as a priest, being female. Matt Talbot was single. Dorothy Day, though she had a couple of lovers and a child, was never married, and lived most of her life as a single mother - edited to add, she did become a Benedictine oblate at some point, but had been working in Catholic social justice areas for years before that happened. It’s hard for me to see these people, and many others who put in a lot of effort praying, teaching or caring for others, or working for social justice, as being without a vocation.