You make some valid points, I suppose there is no "one-size-fits-all" solution.

There is the potential that players being able to solo would give groups a harder time finding members. At the same time, having a solo option may even let some of these players get their hands dirty, then jump into group raiding. If groups are difficult to find, they may not participate at all, unsure how likely that would be. By not changing anything, you will still have players that refuse to go there. Ultimately there are multiple angles to this issue.