Everything has become slightly harder, but the current hardest tier 3, Alakazam, still isn't anywhere near as difficult as it was before the rebalances last autumn. At least Claydol seems to have moved back to being downright impossible without a near optimal team or weatherboost, but it's not in raid rotation currently.
Rock Slide on a Machamp boss isn't that relevant, it hits pure psychics for less damage than Dynamic Punch or Heavy Slam did. These changes really do not affect the viability of counters much because you can generally see the boss's charge move from the autoselect and build your team accordingly.
