The Fluke 87 is meant for industry! You're supposed to toss that thing in your toolbox and shove those probes up a VFD's proverbial behind while standing in a pool of oil and piss. Industrial drive electronics will take 7V probe voltage easily, they'll also take 70V actually. It's designed for its use case, I'm not quite sure why it became popular among hobbyists.
On the other hand the 15b+ is more geared towards bench use I think.
The DMMs which are contemporaries to the Fluke 87 series do not suffer from this flaw and make no mistake, it is a flaw with respect to electronics applications. I never bought a Fluke 87 series but had I discovered that it used such a high test voltage, I would have disqualified it instantly for electronics use. Let's see ...
Fluke 87-1 1989 Ohms Test <1.3 volts
Fluke 87-1 1989 Diode Test <3.9 Volts
Fluke 87-2 ---- Ohms Test <1.3 volts
Fluke 87-2 ---- Diode Test <3.9 Volts
Fluke 87-3 1997 Ohms Test <1.3 volts
Fluke 87-3 1997 Diode Test <3.9 Volts
Fluke 87-4 1999 Ohms Test <5 Volts
Fluke 87-4 1999 Diode Test <5 Volts
Fluke 87-5 2004 Ohms Test <7.9 Volts
Fluke 87-5 2004 Diode Test <7.9 Volts
It is disappointing that they kept the 87 model number on a meter which behaves so differently. I wonder how many mysterious failures will be caused by naive users of the Fluke 87 series 5 meters. It will be little consolation when Fluke points to the specifications and says that it is not their fault and the user should have known.