Hm. Mulled over the Ice changes. Loses offense. (Trades super-effective versus Grass away to be normal effective versus Steel, technically.) Appreciates the straight defensive buff for sure.
Asks if that actually solves Ice's problem, however. Runs deeper than type matchups. Designed most with poor Speed outside of Hail, lopsided defenses, and double weaknesses. Contains only not crippled by these: Galarian Darmanitan, Alolan Ninetales, Mamoswine?, maybe Weavile, and perhaps a legendary or two like Glastrier. Fixed a few double weaknesses, like Articuno's. Is it enough? Shrugs.
Improved Weavile's standing for a Hail team. Deals with the Grass types that Alolan Ninetales now fears. Helped out Frosmoth considerably between this and Bug's changes. Shed itself of both double weaknesses. Takes double damage from Fire, Rock, and Flying now. Resists Water, Grass, Poison, Dark, Ice, and Ground. Could be a strong Special pivot with Ice Scales.
Segues into Bug's changes. Enjoys the considerable defense buff once again. Continues to likely be held back by something from the competitive side: Stealth Rocks. (Note: Is not a competitive player. Take this entire post's opinions with a grain of Shoal Salt.) Tied Bug up with Flying often. Doubles this pain with Bug's (increasingly less unique) move: U-turn. Weighs down its best users like an Iron Ball. Adds Rock Slide being a common move (for damage and flinch chances) in Doubles.
Biggest winners from Bug changes: Escavalier + Scizor (no more double Fire weakness), maybe Water/Bug types, and Bug/Poison types (three weaknesses, four resistances, and
three double resistances).
Brings up one concern, also: Psychic-types. Suffers hard from these changes indirectly, if effective. Pushes up Poison, which makes Psychics more valuable. Also boosted Bug, Dark, and gave a resistance to Psychic to Grass. Bodes ill for a type already being suppressed by Knock Off, Sucker Punch, and Poltergeist(?).
Apologizes if this all sounds negative. Helped out types which need it. Mostly weakened types faring more than fine currently. Did pretty well. Might lead to a resurgence of Scizor, in particular. Imagines Mega Beedrill tearing it up too. Cannot say how the scales would tip as a result. Values certain Pokemon more based on the current dominant type.
Edit: Spoilered the list of changes in the Google Doc, relative to current mechanics. May help others to see differences, rather than the end result. Found it useful, personally.
Should be correct.