landing gear accidents were due i believe to it not being considered safe to do a landing with gear not down a locked so an unsafe indication could involve an ejection for safety reasons. other types wouldn't have this problem for the same fault. Engine fires were a different issue , fuel leaks in hot areas causing control runs burning through or loss of hydraulics. If you look at more modern types we have learnt the lessons of those years and put better systems in place. design of fuel couplings in particular , we ended up x-raying couplings after leak checks to ensure all parts in correct position. also now there are generally back-ups for hyd failures.