I just want to point out that the Ba'ul creature was portrayed by an actor called Javier Botet. Look him up, he's a well known monster character actor. So while the slime was cgi, there was a live actor under there. Think Doug Jones but even taller and thinner.
As for the Edith Keeler/Gary Mitchell/Kelpien vs Ba'ul debate, I really liked how on TOS sometimes there were no solutions left and Kirk had to make the best worst decision he could. This is far more realistic than always coming up with a technobabble last second 'third way' that TNG and VOY sometimes leaned on. Kirk certainly tried other options first before being forced to act. Similarly, I think it was clear that Pike's hand was forced. He attempted to mediate first and offer to settle the situation diplomatically, but the Ba'ul were in panic mode and unlikely to listen. In fact, they were prepared for planetwide slaughter.
While it's great to see Discovery prevail, I do enjoy seeing them faced with choices which aren't so clear cut or easy to skirt the consequences of.
I had no problems with Tyler's scenes, myself. He was fulfilling his role as liaison between Pike and S31. He's there as a sounding board and to offer a different perspective. One which is less forgiving and kumbaya when it comes to such situations. He has a unique perspective, too, having both Voq's memories and his own. He's been bowel deep in state espionage and treachery before, and seen and experienced the full cost of being at war at first hand. Of course he's going to be wary of new incursions which might lead to more war and conflict. Pike is not his commanding officer, so he can speak more freely if he wants to, up to a point.
I've noticed some push back on the internet if
anyone dares to appear to undermine Pike's authority. It's interesting to observe. While he's the captain and has final say, Pike is also working with experts he's asking for input from. In this episode, for instance, he appointed Burnham as the lead on the mission. Which is why he consulted with her on some decisions. Yet people are chafing at what appears to be his deference to her. Saru gets some flak for being insubordinate and yep he did come dangerously close to that, but Pike knew when to draw the line and order him off the bridge before he crossed it. Pike gave him some leeway because he understood why Saru was so compromised. Similarly, he consults with Tyler. He doesn't always agree with what he says, but it's good to get different perspectives. If there's tension there, it's understandable and will probably eventually be resolved as a plot point.
I really like Pike's command style, but some people seem to want him to be more hard-nosed and authoritarian. I don't. I like him leading in a way that's still respectful and accepting of the advice/recommendations of his crew. He seems to admit when he's not an expert on a subject or having doubts about the way forward, that's refreshing. But in the end, he does still make the final decision and makes it decisively.
I think the issue with what Pike decided to do with the Kelpiens might be easier to accept if we acknowledge that the word 'evolve' and 'evolution' is being used a tad erroneously by the ST writers. At least, it seemed clear to me that what was really happening was a kind of puberty, a maturation process which was
always supposed to happen to adult Kelpiens. Basically if left to their own devices and not slaughtered routinely by the Ba'ul as soon as they matured, they would lose their ganglia (and fear mechanism) and would develop more deadly quill sacs. That Pike accelerated this normal physiological process was unfortunate but they were running out of time. I do think this is different than forcing a different stage of evolution on a species (and ST still has wonky linear thinking about what evolution means at the best of times).