Wish and Miracle shouldn't be things that are commonly available. A wish should be special, not something any 17th-level wizard can pass out like candy. As for summons... the spells as written are bad design all around. Not only do they offer way too much variety for the investment, not only to they break action economy, but they're clunky-- they make the summoner's turn take up way more time than anyone else's, and require you to either carry a binder of extra character sheets or stop in the middle of a fight to look things up. The Conjurer and Druid still get to play the summoning game, don't get me wrong, but they have to do so via class features that are easier to balance.