Ravi Chauhan
Taking approval – Yes all the time
Making changes – if inline without your SEO vision then NP. If against your SEO vision then stand up to them. Its best if you guide them against it as you are the ultimate expert not them. They may have the best ideas that need to be heard but you own the strategy not them.
Kevin Whelan
You have to get their agreement because it's their website and they are paying you.
BUT…
They've also hired you for your expertise and should not be interfering,
Whenever a client "suggests" a change to something I've done, I ask them how that change will improve the goal. I then explain why I've made my choices and unless they can empirically argue against it, I insist on doing it my way.
Basically I remind them that this is all about them getting new customers and making money and NOT about their personal preferences that have zero to do with the actual business.
A couple of times this has happened to the point where I had to tell them that I wouldn't be able to work with them any longer if they persisted. Both times they immediately agreed with me and left me alone.
Sometimes they just need to be told.

Stockbridge Truslow 🎩
There are several things in play here IMO…
First, if it's a landing page designed to rank for a keyword set, but it's not in the navigation, then the page isn't "really" going to pack the punch it needs to rank. It's always better to fit it into the site flow somewhere than to have a bunch of orphans trying to rank. It gives no context and just doesn't really do most of what you want it to do. So… at the base level here, the question has that going on.
As for telling the client – yes. Especially if you are just the SEO team. There are also marketing and sales people involved. There are people who manage the brand and messaging.
For the primary team I work with, we aren't just Search Engine Optimization (SEO) and do the full boat marketing, branding, and SEO stuff. As such, many clients have given us carte blanche. In those cases, if they are considering doing a mailing or something outside of our plan – they actually run it by us for approval.
Other clients have someone in charge of the overall plan and we're there to consult, help develop the plan, and then do the bulk of implementing it (on the digital side, anyway). So, at that point, we have to develop the plan of what pages we're going to create – sometimes month to month, other times we plan it out several months ahead of time. It depends upon the monthly budget.
Inevitably, though, no matter what you're doing in this arena, if you're going to be successful, there has to be one single person who is ultimately in charge of oversight, making sure everyone is working toward the same goals, and that everyone is following the plan properly. If you aren't that person – then you'd better be running things by them before doing them.

Jade N Sherry
I'm curious, in my limited experience. When would you create a landing page for keywords that you wouldn't want to incorporate into your sitemap, navbar and internal links? Why not make the page worthy of meeting all factors, which I would think, would improve your client's website most effectively, not just for keywords on a disconnected page, but for the site's overall content and structure? Could you maybe provide a link to an article that would help me understand the concept or purpose?

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