If you think this, you missed a lot of what FF10 had to offer. The whole point in FF10 was that each character had his strong points and you'd use them to take down certain type of enemies. Tidus would be good for normal beasts, Wakka would be good for flying enemies, Lulu would be used against elemental enemies, Auron could beat armored enemies and so on. You wanted to use your characters for these purposes because it's the only way you'll get overkills on normal enemies which gives you 1.5 times the exp you'd normally get. Obviously you didn't do this. You also wanted to swap members to keep your whole party at good levels so that you could keep getting overkills through the whole game. In FF10 weapon and skill modification took a bigger role and it took some planning to beat some of the latter bosses in the game (especially the optional ones) and you can't say same about FF9. Elemental system was also improved and you could actually see what elements would be good/bad against enemies instead of having to guess. In this way, elements became more important in FF10. And you can't deny that FF10's turn system didn't have more depth than ATB since you would see more turns and therefore actually plan your attacks instead of just WAITING FOR ATB METER TO FILL. Some skills were fast and others were slow and at times it was really important that you'll get your turn before the enemy. There was so much more in FF10's battle system than FF9's and it's a fact. A fact. If you are going to deny this, start saying why instead of just stating it's your opinion. You should be able to back it up.
First of all, you can't say FF9 is faster than FF10. It's just wrong. Even at the fastest speed, FF9's ATB meters are really slow. REALLY slow. Not to mention that the animations (even all the normal ones) were way too long and made the battle system really tacky. I like FF9 a lot but the battle system is complete and absolute crap.
It's not the same. Trance was activated automatically the moment the trance bar was full. It made no sense and was absolutely stupid. And unlike in FF9, in FF10 every character had a clearly different overdrive which were more than CHOOSE AN ACTION FROM A MENU. There were also many different options to fill the overdrive bar with and you could choose which one your each character uses. Overdrive system is obviously deeper and better planned than trance system was.
They didn't become obsolete at any point of the game. Summons were useful for getting overkills, and you could fill their overdrive during normal encounters and unleash powerful attacks against bosses. You could use them as tanks to take on bosses' powerful attacks to avoid getting wiped out. You could also modify their stats and skills. This compared to FF9... yeah.
You can prefer ATB to turn-based all you want but it doesn't change the fact that the old-fashioned ATB is slower and has less strategy involved.
anyway i gotta go cu l8r mates. 
Actually man I didn't strategize when I fought the bosses and even the optional ones in FF10, I just went and kill them, like I did in every other FF's. Even so Ozma boss in the FF9 optional bosses was very hard to beat as you needed to have a certain amount of skill, armor and a lot amount of luck and some strategy as compared to FF10 optional bosses like Nemesis which was Regen, attack, repeat.
And the sole purpose of the Atb bar is to strategize on the go. I mean to think a good strategy in a short amount of time, which is for me at least, a fun way to play a game, unlike FF10, which you had all the time in the world to do what you want which makes it as slow as fuck compared to good old ATB.
About the summons bit, they only helps for overdrives and nothing more, which takes out the fun of using them. What is the point of having summons if the only good thing about them is using them for one move. Is like using ff4 to ff9 summons all over again; the concept of summons in ff10 just became stupid and useless as the game progressed.
And overdrive works the same way as the limit in FF7 as in an almost exact copy, just choose the limit you want and just attack the monster/boss etc. And it is not different than FF9 in that aspect.
Also the elemental system didn't improve, the only difference is that you could see what elemental power you need to kill x monster, which can be easily done in a rpg maker game if some faggot decide to make scan a 1 level skill. Oh god look, I just thought of a good design idea, I am making a topic about this

I am not going to begin with the animations, they were as long as fuck, form ff7 to ff9, but ff10 wasn't short either cause I remember I sometimes got impatient waiting for my turn to come, specially when bosses used their special moves. Oh god the nightmares
