Without that, it is just way too easy though, as you can type stuff like "aeiou" and optimize for the highest scoring letter combos. Like you don't really have to bother trying to play the wordle part with much of your brain at all, as what makes that game difficult was elided. Maybe instead of dying the word just clears and doesn't count (which means you have to play flappy bird for longer while you re-do the word). I think if that were the mechanic I would find it fun enough to play a lot.
I am sorry but I don't quite get your point, which might mean you didn't understand mine. FWIW, I'm the kind of person who was excited by Wordle only until it got boring and all of my friends started playing Octordle as that's the only place we started to feel any challenge ;P.
There are two problems: the first is that you absolutely can beat this game way faster than Wordle as it relaxes a key limitation of Wordle. Let's say you play "ETRAO" as your first word. Already that's easy easier than Wordle, as you can just type stuff for that first word and gain way more information than otherwise you should be able to.
(Now, that isn't the best distribution for five letters but like, the point is whatever that is is now just a collection of random letters. Someone figured out the best five letter real word starting word, but I have since forgotten it as it has been a long time since I cared; however, whatever it was, if you don't need to actually have it be a word you can do way better, as you can also scramble the order of the word to put the letters in the best positions to learn the most, and this all happens before you start playing the game.)
Now for some later word let's say you really just want to know if A goes somewhere... with Wordle you have to guess an actual word, which means you have to 1) figure out a word that matches the constraints you are trying to optimize and 2) doesn't waste much of your guess by reusing stuff you already know.
In actual Wordle that's essentially most of the challenge: "is there a word I can come up with that simultaneously checks on that A but also uses this Z and this Q I have left over, preferably without using U because I have nothing to learn from U anymore?" It stresses your vocabulary in addition to stressing your logic ability. In this game you just type the Z and the Q and move on with your life as vocabulary only matters for a real guess.
The other problem with this relaxed ruleset is it kind of undermines the real challenge of having to simultaneously play Flappy Bird: you are sitting there in a panic trying to figure out a word you can play and... you know? screw it: just relax and play that Q you think might be relevant and don't waste your brain power coming up with a word right now as you don't need a word.
Unfortunately, this amazing game is too frustrating for me to experiment and find out myself, but...
What I mean is, of course wordle-with-unconstrained-guesses is easier than wordle. But flappy birdle isn't just that, it also has a timing element.
So for any solution word, there may be a good series of letter strings you can guess to reach the solution quickly. But the best way to progress through that series is to adjust each guess in response to the information revealed by the previous guess.
In flappy birdle, if you guess letter strings quickly to fly the bird, the tradeoff is that you can't put as much thought into adjusting those guesses based on the previous guesses. So there is still a challenge, even though the constraint on the guess strings is relaxed. The goal isn't just to solve the word, it's to solve the word and pilot the bird.