.I was going to throw together some grid mockups showing how unlikely it is that "enough movement" is going to be a non issue during actual combat conditions but I think I'd rather set the bar higher and instead ask you to show three combos conditions where enough movement is a plausible limiting factor without resorting to a narrow hallway type scenario. I say three because it seems reasonable to expect if this is going to be an at all common thing rather than an extreme edge case given how static and unmoving 5e combat tends to be when PCs are past the close to target initial phase and plausibly involved enough to have low hit points where a hypothetical touch healing word might be needed.
Instead of posting some hypotheticals, I'm going post some actual combats online that proves this out. Here are the last three D&D streams from the favorite DM I follow on You Tube:
1.
This is a 4 hour single combat and very few PCs were in movement distance of one another the whole fight. At one point one PC starts moving towards another for 3 straight rounds to try to get into touch range of another frightened PC (and never actually gets there).
2:
There are three combats in this stream, the first one starting at 58 minutes and through that 4-round combat all 4 Pcs were never within 30 feet of each other (note the squares are 10 foot each).
There is a second combat that starts at 2:13 and again at no point are all 4 PCs within movement of each other.
There is a 3rd combat in this starting at about 2:58 and the end of round 1 is the only time they are all within movement range of each other. It looks like at the begining of round 1 they are, however there are two allies between the northmost and southmost ally, and difficult terrain to the east, so they can not all reach each other until the one ally moves out of the way near the end of the round. A bad guy then moves into the gap and makes it two groups of two and then one of the weaker characters backs up, as a result it is part of one round out of seven they can all reach each other.
3:
There are two combats in this stream. A combat starts at about 20:00 and they are all within reach of each other in most of the rounds. They were within reach not for the begining of round 2 and rounds 9, 10 and 11, but they are for all the rest So overall I will say 8 of 11 rounds they were all within movement range of each other.
Another combat starts about 2:30 and the PCs are all within walking distance of one another in round 1 and 3 out of four rounds of combat
Result:
So in those three streams you have about 40 rounds of combat or so and the PCs are all within walking distance of one another about 13 out of those 40 or so rounds. I think this is pretty typical. Note I did not look for examples to prove my point, these are the last 3 D&D games this DM posted.
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