I use UV filters on just one lens, with a picture of which lens I work and why it is UV on it, I must use the lens hood to protect it on other lenses, in this particular case, and from the enclosed it can be seen that the lens hood is not enough, that is my opinion and experience with which I am satisfied, this lens was on the APSC Pentax camera and now on FF, I recommend in the same conditions on other lenses
with an internal focus without adequate front lens / glass, I do not have expensive lenses, and I have to protect this
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there is a UV filter placed on it (not noticeable)
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viewed from the side it looks like this
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when focusing and changing lens range without UV filters looks like this (the inner part of a lot of walk)
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eg. protection with no original lens hood: