As a CisMobilityAid user, I want all TransMobilityAid users to know that them using mobility aids is not at all "taking away resources" and that they're actually doing a lot for public disability acceptance.
While it's true that high quality and super advanced mobility aids may be hard for CisDisabled people to get (mostly due to most CisDisabled people also tending to be poor) the more people that buy them at all will make the demand higher and hopefully eventually lower the cost in the future since more people will be willing to provide high tier mobility aids if they see the money in producing them.
Plus, low grade or average mobility aids are super easy to get. We got most of ours off Amazon or from local stores. These are often in stock all the time and there are tons of choices to choose from (though a lot are technically the same thing but from different companies). There is no way you are "taking away" anything from a CisDisabled person; they'll also be able to find mobility aids for themselves.
And on top of all of that, the more people who openly use mobility aids, the more that they will become normalized— especially if younger appearing people start using them more and more. It will also lower the stigmatization for CisDisabled people who don't need to use their mobility aids all the time, such as ambulatory wheelchair users.
There are literally no tangible downsides to TransAbled people using mobility aids even if they "don't have to". The only possible downside is the increased risk of violence due to being perceived as disabled; though I'm sure that's a risk most TransAbled people have already weighed if they're considering buying or using mobility aids.
Basically, if you're TransAbled and considering getting mobility aids but have some anxiety about it this is your sign to go get those mobility aids and be proud about it!