I allow for the training in almost anything tools, weapons, skills and languages.... however i don't use the downtime rules training involves using the skill, language,tool or weapon in play
I like it i can use most of it in my homebrew campaign if wizards were to give it even minimal support i.e. a map and expanding the existing pdf. Even if they put a price tag on it people will buy it
I have zero problems with killing characters in any edition of the game i believe in permanant level drain, death via massive damage, and save or die effects. I also have no problems assigning high DC's for traps. I do not see the big deal the hero's are not supposed to win all the time...
Temple of the sleeping god (homebrew adventure homebrew world)
30 1/4(50 xp) goblins Spread out across the the temple in groups of six
One duergar smith(200 Xp) Can be be bargained with)
2 trapped books one paralysis the other shocking grasp (100 xp a peice)
one illusion trap rope...
I have zero problems at my table with the use of technology at my table and none of the other GM's who run at my table have a problem with it either. With the ezxception of oldest member of our group all of us from my twelve year old nephew up to me uses technology of some sort. Be it a phone...
While monks are not immune to gravity they have a very fluid relationship with it that allows them to do things that are conisdered mimpossible by laymen ... thats my story and i sticking to it :)
perhaps you would best be served by not allowing short rests to regain spells and limiting cantrips to to say casting stat bonus times 2 per day or no longer allowing cantrips at all.
I use at the table my laptop for campaign management, an ipad with herolab loaded on it, a windows 10 and android tablet for rule books and map display in addition to my other books.
As a player i use just my tablets and i turn all the volumes down so when the action does not focus on me...
one session to go from first to second level aggravates my inner grognard my party played a month of sundays before they hit second level ...
edited because i have fat fingers sometimes
As a Dm i would never shoehorn anyone to play anything they don't want and occasionally i have even assigned an NPC cleric to the group fro a full share of the XP I just can't get behind the ideo of forcing someone to play something they don't want.
The monsters as they are presented are meant to be the baseline and the DM is expected to and often encouraged to modify them to their vision of what the encounter should be. It is absolutely okay if the PC's do not win all the time
I tend to make greater use of traps, tricks, and noncombat obstacles in addition to combat encounters in conjunction with random encounters which tends to increase my encounter metric from 6-8 to 12-15.