Do we need more bot lane champions?

Bot lane makes up 2/5ths of the champions picked in champ select, with less than 2/5ths of viable champions

usually bot lane has 2-4 respectable support choices, almost always including thresh, and 2-4 respectable ADC choices, almost always including Jinx

Supports chose between tanky stunbot, Bursty stunbot, or spammy healbot, these champions are amazingly fun to some degree but by definition they are too limited, and always provide relative equivalency to the rest of the team in function. Which i mean, they lock people down or keep their allies alive. This is good, but it boils down to lacking in versatility, and as such it limits playstyle of the entire lane, they almost always deal predominantly magic damage.

then there's ADC, you really have two types of adcs, Caster Attack damage, or Auto attack attack damage.

they're always glass cannons, always ranged. More than half of them are always too weak to regularly play.

In contrast we can look at mid and top lane, top lane has AD and AP of all the the following fighters, Bruisers, tanks, along with certain marksmen, and certain mages

Mid lane has almost all of our AP, from Control, burst, sustain, and zone mages... and the vast majority of our assassins. they also have a good overlap with top lane champions and marksmen, we fairly regularly see metas where certain champions like lucian or varus can handle mid lane and get picks, we see Riven and Jayce, along with rumble as well in mid.

ADC has one type of champion, We do not see any generally viable alternatives to an adc, we have only seen one attempt which was the morde rework and that was removed from play due to riot design philosophy.

Every game has two marksmen minimum but not every game has a minimum of 1 of each of the other categories i have listed. when any other type of champion is played so constantly we see heavy handed nerfs across the board to the item pool of that class, When you get so many tanks that even midlane becomes chogath vs galio we see a reduction of power in tanks

when any other class of champion dominates their lane for too long in pick preference we see a nerf of that champion class. If only tanks get played top lane for three or four patches we're going to see items like dead man's plate or sunfire get nerfed.

If only assassins get picked in mid lane we see assassins get nerfed, even when each team has one.

The funny thing is, of all roles in the game i can't really think of any other than ADC's and Assassin which can be set behind by so much just in the first few minutes of the game, and when your team loses bot lane, most supports can recover fairly quickly, but adcs will have a while before they can get back in the game.. so having this holy grail of "We win the game" be present is counter to the efforts of the rest of the team.

I've seen maybe three off meta combos that work, and only if the two players in bot lane are in perfect sync. the double hook, the double healer, and the Ivern+Darius