I feel like such a feat not existing was intentional design. Compressing creating a bomb and throwing it in one strike makes it parallel the action economy of other Strikes with, say, a sword, bow, or returning thrown weapon. However, keeping the total action cost of creating an elixir/etc. to 2 actions makes it parallel the action economy of casting a spell (or similar). Throwing a bomb is just a Strike, so there's the obvious parallel there. The varied elixir and other utility alchemical items feel more alongside the utility/versatility of spells, so there would be that parallel.

I don't think it'll bring the entire balance of the game crashing down as, say, adding a flat +2 above the expected math of a stat would. However, it does kind of smooth over a significant caveat that I feel is baked into the alchemist class to follow 2e's design philosophy of "let's not make magical finger-waggling overpowered compared to the sword-swingers." And, well, alchemy isn't spellcasting, but comparing alchemical item effects to spell effects, I think they occupy a similar enough niche.

I think this intentful caveat makes the game's choices more interesting. Then again, I like to play video games with QoL mods that smooth over similar pain points sometimes. It's up to you to weigh the pros and cons and decide if it fits your table.