My wife and I did not sleep trained our kids. They co-slept with us, they were happy we were able to sleep through the night. Eventually they transitioned into their own bed no problem. Our neighbors will let their baby cry like forever, it was excruciating and imo pointless.
I think parenting is the worst possible space for N=1 anecdotes. I have two sets of friends who did what you did and have never slept alone or through the night for coming up on five years. For our oldest, also coming up on five years, we did like one night of sleep training at 18 months and immediately started sleeping through the night like magic. For our youngest, we never had to do anything, he just always slept…
Exceptions:
• if somebody asks for advice.
• if somebody mentions they're about to try an arsenic-, lead- and powdered asbestos-based nasal spray on their kid.
The capacity of the parents is also a bottleneck: time spent paying attention to your uninformed advice is time spent not paying attention to the child(ren). Unsolicited advice is not relaxing, and doesn't help put food on the table; it probably doesn't help.
Though, I think posting on an internet forum might fall into the "if they're asking for advice"; most people visiting such websites are there because they've looked something up, and they expect to be wading through anecdotes.