Do i still need to summon summer banner given my existing team

Ah, another victim of gacha madness. Just a disclaimer I'm telling you this if you don't have much in the way of luck then don't and money then don't.

Still...let me tell you this. Summer Tama is single target (Best use against Archer males) and does different things from the Artoria lancer (np spam AOE), Tesla is AOE and Orion is hard to use outside of arts teams (find myself desperate raising her NP w/o a waver), Tristan is good, so I guess not for squirtoria...and remember how Jeanne's a tank? Holmes is an arts crit servant with support NP? Amakusa hits like a wet noodle, but is a good debuffer and supp?

Still if that didn't convince you, you don't have the luck and money then just wait for the rerun in two years? We're going to have that and possible if NA reached a download milestone then we'll get them again wait for that.
I decided just to wait and aim slightly lower (summer kiyo) since I don't have much in the way of money and my luck is really weird...

Good thing I'm not one of those people who fall into Gacha madness rolling on every single banner, cause I pretty much fall under the caterogy of " Why do I even bother?" and have zero faith on getting anything good. My luck is D rank, so only spending money for the paid Gacha except my luck is bad there as well.

Only question you should ask yourself is how much do you want them? Design wise or their character. Then weigh that feeling against other servants you like or are saving for in the future. If you F2P aim for only 2 or perhaps 3 if they are spaced far enough apart. Even if you are P2P having a set spending limit for your non must have servants is a must.

This is because if you dont absolutely enjoy the character you WILL get bored of them eventually without the emotional attachment rather than just WOW factor. You can probably find someone on the support list to be able to use them.

The summer servants are good, and some like Martha, Tamamo and Altria would help you, but only roll if you actually want them. There is not a single servant that you "need", each have their own benefits.