It has certainly improved my email game. Just put any word down, check its percentage strength, and from that it's possible to work out what the 'best' score is, although I know from doing the puzzles that there are sometimes words with higher scores that the system misses.
Once you know what the highest score is, you can often work out, from the tiles in your rack and the openings on the board, what the word has to be, even if it's one that isn't in your vocabulary.
One thing it does not take into account, though, is defensive tactics: the highest-scoring word might leave your opponent the chance of a bingo, a treble/treble combo, or something like that, while the lower score gives you a better chance of winning the game.

@thatguythere202 Well, I only play e-mail, and I find that, by hovering over the edge of the play button, as well as getting the rough colour code, I am given an exact percentage of the highest possible score (according to the lexulous bot/algorithm). From this I can calculate the points available for the highest score, and from that sometimes what letters need to go on what coloured squares to achieve it. It sometimes leads me to look for, and find, bingos that I missed. Of course, the highest scoring move isn't always the best in game-play, as you may want to defend, manage your rack, or set up a future move, but I enjoy working out what it is anyway.
As I'm more interested in puzzles, anagrams and word games than I am in competing, I find the new protocol suits me very well, but I can see how it might get in the way if you're interested in playing with a ticking clock.

@mistertoad No, I'm saying that the reason CH disappeared from your list was that for the game for which you supplied a screenshot you were using the American dictionary, which leaves out several words familiar from the British English dictionary, including CH and ZO.

@dan-mitchell
and sometimes - well, once so far - you can find a word that scores more than their 100% word, and that immediately gets upgraded to the new maximum strength.

@betterlate1-0 In the USA, Yankee is always a proper noun. In the UK, it is used with a lower case to indicate a particular type of bet, covering four outcomes as six doubles, four trebles and an accumulator.