I think it’s really simple. For me, if I haven’t seen the set work in an icky RF environment typical of many SOTA summits or I have a report from someone I think is competent enough to walk and chew gum at the same time, then I would not spend my money on the radio. That is unless it had some other amazing feature I needed. I’m sure there are many handies that are fine and many that are rubbish. It’s not something where you can say Yaesu is fine but Icom is rubbish as the individual models vary. I seem to have had a lot of Yaesu gear.
I have an old Yaesu VX170 that is bullet proof, the replacement FT270 is bullet proof. The dual band, dual mode FT70 is reported to be unaffected. The old FT60 is bullet proof too. I know the old Kenwood TH79 dual band handheld is bullet proof.
I had a Yaesu FT470 which was unusable near other VHF services. And Icom IC80 which was terrible. I still have an Alinco DJ-G7 which is quite unusable on 2m but I only use it for 23cms. My old Yaesu VX-1 is iffy in such environments.
Until you can find someone who has one and has used it in an RF rich hilltop, I would keep my wallet tightly closed.