As always, context matters, and YMMMV.
For myself, my experience was on-duty use of TLR1s ad X300s in conjunction with Gen3 Glocks. I went to the WML for all of the above valid reasons. I ditched them because, for ME and MY hand size/weapon interface, it just didn't work out. My digits were too short to easily access the switches on the light bodies, so it would only be useful with a grip switch. The SL Contour switch for the TLR1 completely interfered with my grip on the pistol. The SF DG switch was much better in that regard, but still had minor issues. In addition, the rubber coating on the unit would get rubbed/peeled of after several draws and holsterings. I wound up dumping the WML, even for duty use. I am not opposed to the concept but it will need to work for ME. I'd love to try out something like a CT Railmaster pro with the switch on the frontstrap, but it isn't out there yet.