I do not mind walking in the company of others, but my biggest gripe, is having to adjust my walking fitness or experience, to fit in to less fit members of the group.
I know that sounds selfish, but when i have a particular walk planned, its very rare, for me to curtail the planned route, as i tailor each route to my own fitness and experience.
Years ago, i can remember many a jaunt in the Brecon Beacons, being cut short, or cancelled all together, when certain group members, found an easy enough walk too demanding.
When a walker struggles to keep up, you never leave them behind, you have to adjust your speed to theirs, which is not always easy.
Regular fit walkers, know their walking speed, and to suddenly have to slow down, to suit other's, is a nuisance.
If someone moans, and say's they want to turn around, you have to accompany them, because i know full well, if the walker gets lost, others will get the blame.
I can remember one walker in a challenge event, in the Beacons, getting hopelessly lost, resulting in an extensive search for them, simply because nobody accompanied them back to a known checkpoint, walkers in the group,just presumed the walker was experienced enough to look after themselves in the hills.
There's lots of pros and cons surrounding solo walking, but when you go it alone, you only have yourself to worry about, and if you feel full of adventure, an easy walk can be turned into a serious outing.
Its solo walking for me.
Going it alone, its up to you, how hard or easy you want to make a walk, and if a fellow walker does not show up at an agreed time, there's no issues.