1) It doesn't reliably offer round-trips made of 2 one-way tickets from 2 different airlines.
this is an extremely bad thing for the baseline normal person and will fuck over normal users hard because they are not competent enough to handle this. most sites do not do this, kayak only does this with piles of warnings to click through and call it a hacker fare
3) I live in an area served by multiple airports. Similar to my first issue, I feel like Google Flights no longer reliably shows me round-trip itineraries that depart from one airport and arrive an another (e.g. depart from Heathrow, arrive back in London at Gatwick). Once I pick a departure airport it
similar to 1) the least common denominator end users cannot reliable handle a "multi city" flight
Maybe the simplicity thing for the typical person is the reason behind these recent changes, it's just a shame as I really valued the previous behavior and there doesn't seem to be any toggle to get it back.