There are several members of this forum who would disagree with you, including some learners. I do hope, for your students' sakes, that you don't make your feelings obvious.
Few languages outside artificial ones such as Esperanto 'make sense' in the sense of being completely logical.
The kids hate English grammar, and they are very open about it. The vast majority of them are Indonesian L1 (with a few Chinese languages scattered in to make pronunciation training more difficult).
Indonesian doesn't mess around like English, as can be demonstrated with the following:
I went to Jakarta yesterday / Yesterday I 'ever' to Jakarta.
I have been to Jakarta/ I 'ever' to Jakarta.
I will go to Jakarta tomorrow / Tomorrow I to Jakarta.
I'm on my way to Jakarta / I to Jakarta
Articles are defenestrated as well - I ever to museum.
That same simplicity applies to all verbs, regular and irregular.
There are no gender specific or plural pronouns, so 'he/she/they' are all 'Dia'.
Now, the question of fibbing to the kids comes up. Do I tell them porkies, or should I be honest but add an explanation as to why they need to learn the tongue?
I prefer to assume the children are intelligent, and they usually prove me right.
Covid learning loss is a killer for many of my grade 4, 5 and 6 kids so I don't expect as much as I otherwise would, but that issue doesn't apply to grade 3 and below. I only got three CEFR C1 speaking and listening results from this year's grade six, but I want to see about 20% of the class hit that mark when grade 3 rise to 6. Achieving that requires the kids to trust me, so terminological inexactitudes about the wicked witch of the west we know as grammar are, in my most humble of opinions, unwise.
To your assertion about how few languages make sense, that's open to argument. Anything Latin based, or Latin influenced, tends to be full of complicated grammar - That sorts out the romance languages.
English is even worse because of the Celts, Romans, Angles, Saxons, Jutes, Vikings, Normans, and Americans have turned the language into a Mashup of vocabulary and grammar from a variety of conflicting influences. Add a bunch of well meaning but foolish academics stuffing extra letters into words to make spelling more 'Latin' flavoured, and you have a lousy language as far as ESL learning goes.
South-East Asian languages tend to be far simpler, unless European colonialists messed them up.
On the down side, an Indonesian Shakespeare would never have had schoolkids moaning about having to learn about Scottish kings murdering people, or his dog hating wife (out, damned Spot), because the language's simplicity doesn't allow for the sort of wordplay that made Shakespeare so great.