Everything you mentioned a) can be learned on the spot, and b) has been a solved problem for at least a decade. Accessibility offers no technical challenge what

Everything you mentioned a) can be learned on the spot, and b) has been a solved problem for at least a decade. Accessibility offers no technical challenge whatsoever and, _if correctly prioritised_, can be handled by _any_ developer at _any_ seniority level. You should stop expecting every junior to have the same domain knowledge you developed over a decade or two. The challenges are elsewhere.