No it wouldn't be rude provided you explain why.
OK, here goes.
This morning when I unscrewed the pump head the valve core came out. This has happened before. I put the core back in try to inflate but no joy, unscrewed again and the core came out.
Do you use a valve core tool or just going finger tight? I strongly suggest that you use one, or in a pinch pliers. If the core is tighter than the valve head then it will not unscrew. Even better use a push fir pump rather than screw.
When I thought about this more I realised in the last 12 months I have:
What sort of problem scan you have with a valve? Tighten the valve stem in the rim so it does not leak and tighten the valve enough so it will not unscrew - that is about it.1. Been to my LBS +/- 6 times with valve related problems. I generally get one puncture a year.
Valves should very rarely get gummed up, with a valve core remover of pliers they are easy to get out and clean. I refuse to believe that expensive track pumps will not inflate a valve, even a gummed up one unless you are buying ones built for volume rather than pressure.2. As I've had regular inflation difficulty I ditched two old track pumps and replaced these with two more. Meaning I've used four different track pumps in a year in attempting to overcome inflation difficulties - basically unable to force air in. The track pumps were £30 and £60 so a £90 investment.
Firstly, you should only ever need a tube if you have a side wall split, or a catastrophic fail, these are thankfully very rare. Being unable to reinstall a tyre is bad technique and or tools. If you got it on there once then it is always easier a second time, yes some wheel/tyre combinations are tight (I use Continental so I have sworn a few times myself), but they will go on.3. Had to call International Rescue twice for a lift home when I was unable to reinstall the tyre after inserting a tube. The only occasions in my life I've needed IR.
4. Spent £40 on a plug kit
I have a fairly expensive one myself, on the rare times I have to plus, I want it to be a quick as possible so I don't lose sealant/air or slow down others I am with. I am a dynaplug user myself, less than 30 seconds from stopping to getting going again, you often don't even need to get off your bike.
Finally, many hundreds of thousands of people are quite happy with tubeless just like there are many millions of people happy with tubes. Both systems have their advantages and disadvantages and people will make their own choices, but very clearly both systems work.