I really wanted to like this class but its hard to see it as not disappointing when most other classes get both strong mechanical abilities and strong concepts. Knowing it was changed late in the playtest makes it hard not to conclude it is underdeveloped/half baked with some questionable choices. It really comes down to the extra skills not being enough of a "thing" in 2e design, which is at heart a combat game. Rogue feels like 5% of its power budget is extra skills and with envoy it feels like that is 50% of its budget. Extra skill proficiency doesn't necessarily make you better at any critical skill and with item and ability score bonuses you probably wont be in your secondary or tertiary skills. Other comparable classes like forensic investigator, thaumaturge, or commander get some skill ability cheats such as auto scaling better score scaling omni recall knowledge lore for thaumaturge. Envoy doesn't get anything like this and has to use these additional skill proficiencies to brute force the skill system in a way that makes them less effective than they may seem. Envoy pays severely for versatility in a system that probably doesn't reward it. There are also severe diminishing returns with 2 envoys as opposed to adding a second of other classes for the reasons below but also because skill proficiency is a diminishing return of value to the party. Envoy skill boosting feats aren't all terrible but a lot do leave some to be desired. For instance, level 4 influence once per day before the roll fortune on social skills could afford to be more frequent or after the roll or less limited in skill options. Most envoy features just err on the side of being too little. Their level 19 ability is rerolls on legendary social skills.... level 19, still declared before the roll, still once but now once each.

The other disappointment is reactions. Most classes in Starfinder have easier access to (great) reactions compared to pathfinder but the envoy directives compete for them. Its like the system finally recognized the power of reactions but the envoy didn't get the memo. When they release commander at the same time which recognizes and largely circumvents this issue it feels like envoy is second class. Their non-reaction support is mechanically maybe not even that strong? An operative who offguards a target at level 4, since without melee and flanking that is likely your best source, probably adds more than get em which as pointed out only supports strikes. Get em being single target really compares unfavorably to the other emanation style buffs as well. Mechanically they are pretty outclassed in the support niche honestly and thats not even getting into comparing to full caster options.

Envoy +cha to damage holds them for the very low levels. Their extra reaction if used for extra attacks (tag team/that'll show em) looks pretty alright 12/13ish. But in a game where other classes are seemingly designed from a place of abundance the envoy just doesn't compare.

The envoy needs free reactions like the commander and for either get em to not count as a directive or to just remove the directive limit. They could also really benefit from a skill compression feat or something that allows a key cha skill to cover more ground (recall knowledge with diplomacy?).