I don’t think allow some more options to stay at least somehow more competetive with group content players in endgame for soloplayers would cause harm to game. Quite opposite.
By definition, why a solo player would legitimately suddenly like to become “competitive” with a group-player ?
Group-focused people that dive into endgame have times and TIMES more expenses to sustain than regular solo players. They must pay for their gear, agents, various upgrades, dungeon keys, etc… How would they be able to sustain if suddenly there was no significant rewards for them and no chase items, all of those sellable on the AH? Streamlining everything so that even casual solo players doing random missions could get everything they want without effort would be a spit towards endgame players. The game already spits enough on them as is.
This is a “shared-world” game - it is an online multiplayer game. Key words being online and multiplayer. Not denying that playing solo shouldn’t be an option, but asking for everything to be accessible for solo is a no-go. It’s if i were to ask that my freelance company created by myself and my brother could have a chance to be competitive with Steve Jobs while we casually just make & deliver pizzas.
Alt-friendliness ? For sure! More solo content? Yes please! Group rewards more accessible for solo people? Nope.