There are some very strong opinions being shared here on various "positions" on what YT or TB does or does not do. At the risk of provoking someone, the mysterious YT algorithm continues to change and evolve. It seems to take into account MANY signals and factors whether it be our titles, thumbnails, descriptions, hashtags, the actual content, tags, etc. HOWEVER, humans are the ones that choose what to click and review. We may not agree with what many humans do or their rationale but it is part of the larger equation. I am certain YT algorithm takes that into account what people IGNORE. I don't espouse to any theory where people say "YT just does not like me".
Much of my early videos barely got any views. Did "YT dislike me" in the beginning but then suddenly YT "liked" me more by giving me more traffic? However, YT "likes" me when I produce some videos and NOT other videos? I submit that that YT neither likes or dislikes any of us. It is just processing the many signals it receives and we see results. People also change in their schedules, priorities, moods, and tastes. Nothing is static. Everything is fluid.
I believe it is our job to "feel", study, analyze, test, and vet out patterns. As we get more experience on YT, our brains do a better job of sorting these many factors out. But our brains won't do such a good job if we inject too many personal biases or overly emotional responses.
Swinging back to TB, how I used TB in the beginning is different than how I use it now. Same tool but the way I use the same tool has evolved. Having crossed over 100 videos, channel management has become more cumbersome than when I only had a couple dozen videos. I will say TB makes a compelling discount offer to YTubers under 1,000 users. At first, I wasn't sure but geez, over the course of several months, I like TB and the app.
I do not view TB as "only" an SEO tool. It is but one feature of many. It is a good reminder of tags to use but I don't use it to TELL ME how I should write my titles or description. I am a human being who has the responsibility to write human-friendly titles and descriptions so that viewers (people) want to do click on my video and watch it.
TB is also a channel management tool. It is also a stats gathering tool. For me, the milestones is also a "motivational" tool. Each time I hit a milestone, it is a little victory to celebrate.
Anyhow, no tool (like TB) is a guarantee of success. And it is our jobs as creators to figure out how to take advantage of the YT algorithm, apply it, and make our videos interesting/informative/entertaining for viewers to watch.